Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Employee Stock Purchase Programs (Detail)

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Stockholders' Equity - Employee Stock Purchase Programs (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 2,903 $ 8,501 $ 8,792 $ 11,896
Fortress Companies [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense [1] 963 2,966 3,293 3,359
Employee Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 1,937 3,296 5,490 6,284
Executive Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 0 2,229 0 2,229
Non-Employee Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 3 $ 10 $ 9 $ 24
[1] Consists of approximately $5,000 of Avenue's compensation expenses, approximately $0.8 million of Checkpoint's compensation expense, approximately $130,000 of JMC's compensation expenses and approximately $67,000 of Helocyte's compensation expenses on stock grants for the three months ended September 30, 2016, and approximately $23,000 of Avenue's compensation expenses, approximately $2.7 million of Checkpoint's compensation expense, approximately $458,000 of JMC's compensation expenses and approximately $160,000 of Helocyte's compensation expenses on stock grants for the nine months ended September 30, 2016. Consists of approximately $15,000 of Avenue's compensation expenses, approximately $2.1 million of Checkpoint's compensation expense and approximately $279,000 of JMC's compensation expenses on stock grants for the three months ended September 30, 2015, and approximately $38,000 of Avenue's compensation expenses, approximately $2.1 million of Checkpoint's compensation expense, approximately $279,000 of JMC's compensation expenses and approximately $147,000 of Mustang's compensation expenses on stock grants for the nine months ended September 30, 2015.