Stockholders' Equity - Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Number of Units outstanding, beginning of year (in shares) | shares	1,330
Number of Units, Granted (in shares) | shares	786
Number of Units, Released (in shares) | shares	(241)
Number of Units, Forfeited (in shares) | shares	(16)
Number of Units outstanding, end of period (in shares) | shares	1,859
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, Units outstanding, beginning of year (in dollars per share) | $ / shares	$ 20.40
Weighted Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares	25.57
Weighted Average Grant Date Fair Value, Released (in dollars per share) | $ / shares	18.87
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share) | $ / shares	23.87
Weighted Average Grant Date Fair Value, Units outstanding, end of period (in dollars per share) | $ / shares	$ 22.74
Aggregate intrinsic value at end of period | $	$ 42,367