Quarterly report pursuant to Section 13 or 15(d)

Non-Controlling Interests - Summary Of Components of Non-Controlling Interests in Loss of Consolidated Entities (Detail)

v3.7.0.1
Non-Controlling Interests - Summary Of Components of Non-Controlling Interests in Loss of Consolidated Entities (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Noncontrolling Interest [Line Items]      
Non-controlling interests in loss of consolidated entities $ (2,580) $ (4,438) $ (16,195)
Avenue [Member]      
Noncontrolling Interest [Line Items]      
Non-controlling interests in loss of consolidated entities $ (68) $ (108) (349)
Non-controlling ownership 10.20% 11.50%  
Coronado SO Co, Inc [Member]      
Noncontrolling Interest [Line Items]      
Non-controlling interests in loss of consolidated entities $ (4) $ (5) (19)
Non-controlling ownership 13.00% 13.00%  
Mustang Therapeutics, Inc [Member]      
Noncontrolling Interest [Line Items]      
Non-controlling interests in loss of consolidated entities $ (1,674) [1] $ (70) (1,805)
Non-controlling ownership 52.00% [1] 10.00%  
Checkpoint Therapeutics, Inc [Member]      
Noncontrolling Interest [Line Items]      
Non-controlling interests in loss of consolidated entities $ (2,734) [2] $ (4,037) (11,733)
Non-controlling ownership 62.40% [2] 62.70%  
JMC [Member]      
Noncontrolling Interest [Line Items]      
Non-controlling interests in loss of consolidated entities $ (68) $ (121) (355)
Non-controlling ownership 7.00% 8.10%  
Helocyte [Member]      
Noncontrolling Interest [Line Items]      
Non-controlling interests in loss of consolidated entities $ (323) $ (97) (1,155)
Non-controlling ownership 20.00% 8.30%  
Cellvation [Member]      
Noncontrolling Interest [Line Items]      
Non-controlling interests in loss of consolidated entities $ (54)   (158)
Non-controlling ownership 22.00%    
National Holdings [Member]      
Noncontrolling Interest [Line Items]      
Non-controlling interests in loss of consolidated entities $ 2,490   $ (621)
Non-controlling ownership 43.40%    
Caelum [Member]      
Noncontrolling Interest [Line Items]      
Non-controlling interests in loss of consolidated entities $ (145)    
Non-controlling ownership 25.50%    
[1] Mustang is consolidated with Fortress’s operations because Fortress maintains voting control through its ownership of Mustang’s Class A preferred shares which provide super-majority voting rights.
[2] Checkpoint is consolidated with Fortress’s operations because Fortress maintains voting control through its ownership of Checkpoint’s Class A common shares which provide for super-majority voting rights.