Stock-based Compensation - Summary of SARs Activity (Detail) - Stock Appreciation Rights (SARs) [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Beginning Balance | shares	389,955
Granted, Shares | shares	215,288
Exercised, Shares | shares	(27,596)
Forfeited, Shares | shares	(24,065)
Shares, Ending Balance | shares	553,582
Weighted Average Exercise Price, Beginning Balance | $ / shares	$ 50.30
Granted, Weighted Average Exercise Price | $ / shares	43.95
Exercised, Weighted Average Exercise Price | $ / shares	54.17
Forfeited, Weighted Average Exercise Price | $ / shares	34.58
Weighted Average Exercise Price, Ending balance | $ / shares	$ 47.81
Weighted Average Remaining Contractual Term, Ending balance	7 years 11 months 9 days
Aggregate Intrinsic Value, Ending balance | $	$ 18,642