Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
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
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Noncontrolling Interest [Line Items]              
Non-controlling interests in loss of consolidated entities $ 3,039 $ 1,694 $ 243 $ 479 $ (5,455) $ 0 $ 0
Avenue [Member]              
Noncontrolling Interest [Line Items]              
Non-controlling interests in loss of consolidated entities         $ (567)    
Non-controlling ownership 11.50%       11.50%    
Coronado SO Co, Inc [Member]              
Noncontrolling Interest [Line Items]              
Non-controlling interests in loss of consolidated entities         $ (240)    
Non-controlling ownership 13.00%       13.00%    
Mustang Therapeutics, Inc [Member]              
Noncontrolling Interest [Line Items]              
Non-controlling interests in loss of consolidated entities         $ (373)    
Non-controlling ownership 10.00%       10.00%    
Checkpoint Therapeutics, Inc [Member]              
Noncontrolling Interest [Line Items]              
Non-controlling interests in loss of consolidated entities         $ (3,855)    
Non-controlling ownership [1] 62.30%       62.30%    
JMC [Member]              
Noncontrolling Interest [Line Items]              
Non-controlling interests in loss of consolidated entities         $ (420)    
Non-controlling ownership 8.80%       8.80%    
[1] 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.