Stockholders' Equity - Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2016 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	1,139
Number of Units, Granted (in shares) | shares	435
Number of Units, Released (in shares) | shares	(281)
Number of Units, Forfeited (in shares) | shares	(70)
Number of Units outstanding, end of period (in shares) | shares	1,223
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	$ 19.30
Weighted Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares	16.48
Weighted Average Grant Date Fair Value, Released (in dollars per share) | $ / shares	15.92
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share) | $ / shares	21.13
Weighted Average Grant Date Fair Value, Units outstanding, end of period (in dollars per share) | $ / shares	$ 18.97
Aggregate intrinsic value at end of period | $	$ 30,432