Stock-based Compensation - Summary of SARs Activity (Detail) - Stock Appreciation Rights (SARs) [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Beginning Balance | shares	231,182
Granted, Shares | shares	187,527
Forfeited, Shares | shares	(28,754)
Shares, Ending Balance | shares	389,955
Weighted Average Exercise Price, Beginning Balance | $ / shares	$ 57.94
Granted, Weighted Average Exercise Price | $ / shares	41.23
Forfeited, Weighted Average Exercise Price | $ / shares	52.67
Weighted Average Exercise Price, Ending balance | $ / shares	$ 50.30
Weighted Average Remaining Contractual Term, Ending balance	8 years 1 month 28 days
Aggregate Intrinsic Value, Ending balance | $	$ (236)