Stockholders' Equity - Employee Stock Purchase Programs (Detail) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||||
---|---|---|---|---|---|---|
Jun. 30, 2016 |
Jun. 30, 2015 |
Jun. 30, 2016 |
Jun. 30, 2015 |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
Stock-based compensation expense | $ 3,023 | $ 1,925 | $ 5,889 | $ 3,395 | ||
Fortress Companies [Member] | ||||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
Stock-based compensation expense | [1] | 1,051 | 393 | 2,330 | 393 | |
Employee Awards [Member] | ||||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
Stock-based compensation expense | 1,969 | 1,525 | 3,553 | 2,988 | ||
Non-Employee Awards [Member] | ||||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||
Stock-based compensation expense | $ 3 | $ 7 | $ 6 | $ 14 | ||
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