Quarterly report pursuant to Section 13 or 15(d)

Non-Controlling Interests - Summary Of Non-controlling Interests in Consolidated Entities (Detail)

v3.8.0.1
Non-Controlling Interests - Summary Of Non-controlling Interests in Consolidated Entities (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Noncontrolling Interest [Line Items]      
NCI equity share $ 83,095   $ 100,889
Net gain/(loss) attributable to non-controlling interests (17,200) $ (2,580) (32,960)
Non-controlling interests in consolidated entities 65,895   67,929
Avenue [Member]      
Noncontrolling Interest [Line Items]      
NCI equity share [1] 12,719   17,454
Net gain/(loss) attributable to non-controlling interests [1] (6,691)   (4,646)
Non-controlling interests in consolidated entities [1] $ 6,028   $ 12,808
Non-controlling ownership [1] 64.40%   66.10%
Coronado SO [Member]      
Noncontrolling Interest [Line Items]      
NCI equity share $ (290)   $ (236)
Net gain/(loss) attributable to non-controlling interests 0   (54)
Non-controlling interests in consolidated entities $ (290)   $ (290)
Non-controlling ownership 13.00%   13.00%
Mustang Therapeutics, Inc [Member]      
Noncontrolling Interest [Line Items]      
NCI equity share [1] $ 36,961   $ 48,740
Net gain/(loss) attributable to non-controlling interests [1] (3,733)   (11,911)
Non-controlling interests in consolidated entities [1] $ 33,228   $ 36,829
Non-controlling ownership [1] 59.70%   61.60%
Checkpoint Therapeutics, Inc [Member]      
Noncontrolling Interest [Line Items]      
NCI equity share [2] $ 24,662   $ 21,635
Net gain/(loss) attributable to non-controlling interests [2] (5,175)   (12,314)
Non-controlling interests in consolidated entities [2] $ 19,487   $ 9,321
Non-controlling ownership [2] 67.40%   62.00%
JMC [Member]      
Noncontrolling Interest [Line Items]      
NCI equity share $ (461)   $ (469)
Net gain/(loss) attributable to non-controlling interests 56   7
Non-controlling interests in consolidated entities $ (405)   $ (462)
Non-controlling ownership 6.30%   6.30%
Helocyte [Member]      
Noncontrolling Interest [Line Items]      
NCI equity share $ (3,124)   $ (1,907)
Net gain/(loss) attributable to non-controlling interests (33)   (1,193)
Non-controlling interests in consolidated entities $ (3,157)   $ (3,100)
Non-controlling ownership 19.80%   20.00%
Cellvation [Member]      
Noncontrolling Interest [Line Items]      
NCI equity share $ (387)   $ (259)
Net gain/(loss) attributable to non-controlling interests (51)   (96)
Non-controlling interests in consolidated entities $ (438)   $ (355)
Non-controlling ownership 21.60%   21.50%
Caelum [Member]      
Noncontrolling Interest [Line Items]      
NCI equity share $ (2,133)   $ (815)
Net gain/(loss) attributable to non-controlling interests (707)   (1,262)
Non-controlling interests in consolidated entities $ (2,840)   $ (2,077)
Non-controlling ownership 33.90%   34.70%
National Holdings [Member]      
Noncontrolling Interest [Line Items]      
NCI equity share $ 15,805   $ 17,021
Net gain/(loss) attributable to non-controlling interests (734)   (1,216)
Non-controlling interests in consolidated entities $ 15,071   $ 15,805
Non-controlling ownership 43.40%   43.40%
Aevitas [Member]      
Noncontrolling Interest [Line Items]      
NCI equity share $ (356)   $ (126)
Net gain/(loss) attributable to non-controlling interests (47)   (168)
Non-controlling interests in consolidated entities $ (403)   $ (294)
Non-controlling ownership 37.00%   35.40%
Cyprium [Member]      
Noncontrolling Interest [Line Items]      
NCI equity share $ (169)   $ (143)
Net gain/(loss) attributable to non-controlling interests (31)   (15)
Non-controlling interests in consolidated entities $ (200)   $ (158)
Non-controlling ownership 10.80%   11.10%
Tamid [Member]      
Noncontrolling Interest [Line Items]      
NCI equity share $ (132)   $ (6)
Net gain/(loss) attributable to non-controlling interests (54)   (92)
Non-controlling interests in consolidated entities $ (186)   $ (98)
Non-controlling ownership 24.00%   24.00%
[1] Avenue and Mustang are consolidated with Fortress’ operations because Fortress maintains voting control through its ownership of Preferred Class A Shares which provide super-majority voting rights.
[2] Checkpoint is consolidated with Fortress’ operations because Fortress maintains voting control through its ownership of Checkpoint’s Class A Common Shares which provide super-majority voting rights.