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Stockholders' Equity - Summary of Nonvested Shares (Detail) - Restricted Stock Units (RSUs)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Shares Underlying RSUs  
Nonvested beginning balance (shares) | shares 2,124,000
Granted (shares) | shares 843,000
Vested and released (shares) | shares (781,232.000)
Forfeited (shares) | shares (107,000)
Nonvested ending balance (shares) | shares 2,079,000
Nonvested, beginning balance (usd per share) | $ / shares $ 42.08
Granted (usd per share) | $ / shares 57.78
Vested and released (usd per share) | $ / shares 38.41
Forfeited (usd per share) | $ / shares 49.42
Nonvested, ending balance (usd per share) | $ / shares $ 49.45
Weighted Remaining Vesting Period (in years)  
Nonvested as of December 31, 2015 1 year 1 month 28 days
Aggregate Intrinsic Value  
Nonvested as of December 31, 2015 | $ $ 136,857