Stock-Based Compensation - Summary of Stock Appreciation Rights Activity (Detail) - Stock Appreciation Rights (SARs) [Member] - 2011 Equity Incentive Plan [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Shares, beginning balance	959
Granted, Shares	217	246	318
Exercised, Shares	(695)
Forfeited or expired, Shares	0
Outstanding Shares, ending balance	481	959
Vested or expected to vest, Shares	481
Exercisable, Shares	57
Outstanding, Weighted Average Exercise Price, beginning balance	$ 0
Granted, Weighted Average Exercise Price	0
Exercised, Weighted Average Exercise Price	0
Forfeited or expired, Weighted Average Exercise Price	0
Outstanding, Weighted Average Exercise Price, ending balance	0	$ 0
Vested or expected to vest, Weighted Average Exercise Price	0
Exercisable, Weighted Average Exercise Price	$ 0
Outstanding, Weighted Average Remaining Contractual Term	8 years 1 month 6 days
Vested or expected to vest, Weighted Average Remaining Contractual Term	8 years 1 month 6 days
Exercisable, Weighted Average Remaining Contractual Term	4 years 8 months 12 days
Outstanding, Aggregate Intrinsic Value	$ 4,366
Vested or expected to vest, Aggregate Intrinsic Value	4,366
Exercisable, Aggregate Intrinsic Value	$ 508