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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 1,574 $ 1,463 $ 3,395 $ 2,598
Fortress Companies [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense [1] 35 0 393 0
Employee Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 1,525 1,452 2,988 2,574
Non-Employee Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 7 $ 11 $ 14 $ 24
[1] Includes for Avenue $22,900 for compensation expense on stock grants, Coronado SO $178,500 for stock a grant in connection with a license acquired, Checkpoint $32,500 for a stock grant in connection with a license acquired and $12,242 for compensation expense and Mustang $147,000 for a stock grant in connection with the license acquired.