Stock-Based Compensation - Summary of Outstanding and Exercisable Stock Options (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of Shares Under Options, Outstanding at January 1, 2016	1,013,336
Number of Shares Under Options, Granted	0
Number of Shares Under Options, Exercised	0
Number of Shares Under Options, Forfeited	(7,500)
Number of Shares Under Options, Outstanding at December 31, 2016	1,005,836	1,013,336
Number of Shares Under Options, Exercisable at December 31, 2016	957,113
Number of Shares Under Options, Vested or expected to vest at December 31, 2016	1,005,836
Weighted Average Exercise Price, Outstanding at January 1, 2016	$ 24.03
Weighted Average Exercise Price, Granted	0		$ 20
Weighted Average Exercise Price, Exercised	0
Weighted Average Exercise Price, Forfeited	19.37
Weighted Average Exercise Price, Outstanding at December 31, 2016	24.07	$ 24.03
Weighted Average Exercise Price, Exercisable at December 31, 2016	24.28
Weighted Average Exercise Price, Vested or expected to vest at December 31, 2016	$ 24.07
Remaining Contractual Life In Years, Outstanding at December 31, 2016	4 years 2 months 12 days	5 years 2 months 12 days
Stock options life, years	4 years 2 months 12 days	5 years 2 months 12 days
Remaining Contractual Life In Years, Exercisable at December 31, 2016	4 years
Remaining Contractual Life In Years, Vested or expected to vest at December 31, 2016	4 years 2 months 12 days
Intrinsic Value, Outstanding at January 1, 2016	$ 0
Intrinsic Value, Outstanding at December 31, 2016	0	$ 0
Intrinsic Value, Exercisable at December 31, 2016	0
Intrinsic Value, Vested or expected to vest at December 31, 2016	$ 0