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 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Noncontrolling Interest [Line Items]          
Non-controlling interests in loss of consolidated entities $ (5,584) $ (3,911) $ (8,164) $ (8,349) $ (16,195)
Avenue [Member]          
Noncontrolling Interest [Line Items]          
Non-controlling interests in loss of consolidated entities $ (246) $ (76) $ (314) $ (184) (349)
Non-controlling ownership [1] 10.20% 11.50% 10.20% 11.50%  
Coronado SO Co, Inc [Member]          
Noncontrolling Interest [Line Items]          
Non-controlling interests in loss of consolidated entities $ (3) $ (5) $ (7) $ (10) (19)
Non-controlling ownership [1] 13.00% 13.00% 13.00% 13.00%  
Mustang Therapeutics, Inc [Member]          
Noncontrolling Interest [Line Items]          
Non-controlling interests in loss of consolidated entities $ (3,353) $ (89) $ (5,027) $ (159) (1,805)
Non-controlling ownership [1] 52.00% 10.00% 52.00% 10.00%  
Checkpoint Therapeutics, Inc [Member]          
Noncontrolling Interest [Line Items]          
Non-controlling interests in loss of consolidated entities $ (3,972) [2] $ (3,476) $ (6,707) [2] $ (7,513) (11,733)
Non-controlling ownership [1],[2] 62.40% 64.30% 62.40% 64.30%  
JMC [Member]          
Noncontrolling Interest [Line Items]          
Non-controlling interests in loss of consolidated entities $ 20 $ (108) $ (48) $ (229) (355)
Non-controlling ownership [1] 7.00% 8.10% 7.00% 8.10%  
Helocyte [Member]          
Noncontrolling Interest [Line Items]          
Non-controlling interests in loss of consolidated entities $ (276) $ (157) $ (599) $ (254) (1,155)
Non-controlling ownership [1] 20.00% 20.40% 20.00% 20.40%  
Cellvation [Member]          
Noncontrolling Interest [Line Items]          
Non-controlling interests in loss of consolidated entities $ (30)   $ (83)   (158)
Non-controlling ownership [1] 22.00%   22.00%    
National Holdings [Member]          
Noncontrolling Interest [Line Items]          
Non-controlling interests in loss of consolidated entities $ 2,382   $ 4,872   $ (621)
Non-controlling ownership [1] 43.40%   43.40%    
Caelum [Member]          
Noncontrolling Interest [Line Items]          
Non-controlling interests in loss of consolidated entities $ (106)   $ (251)    
Non-controlling ownership [1] 25.50%   25.50%    
[1] Represents a weighted average of ownership during the periods presented.
[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.