Stockholders' Equity - Summary of Status of Stock Incentive Plans and Changes During Periods (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended			72 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016
Number of Options
Beginning balance (in shares)	329,872	434,401	501,202
Options granted (in shares)	0	0	0	0
Awards exercised (in shares)	(16,878)	(55,382)	(46,198)
Options forfeited (in shares)	(53,025)	(49,147)	(20,603)
Ending balance (in shares)	259,969	329,872	434,401	259,969
Number of options exercisable (in shares)	259,969	329,872	434,401	259,969
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 33.65	$ 30.04	$ 28.82
Options granted (in dollars per share)	0.00	0.00	0.00
Awards exercised (in dollars per share)	7.00	3.29	13.66
Options forfeited (in dollars per share)	37.09	35.97	37.04
Ending balance (in dollars per share)	34.68	33.65	30.04	$ 34.68
Weighted average exercise price exercisable (in dollars per share)	$ 34.68	$ 33.65	$ 30.04	$ 34.68
Weighted Average Contractual Life and Aggregate Intrinsic Value
Weighted average contractual life outstanding	6 months 12 days	1 year 3 months 20 days	2 years 1 month 20 days
Weighted average contractual life exercisable	6 months 12 days	1 year 3 months 20 days	2 years 1 month 20 days
Aggregate intrinsic value outstanding	$ 246	$ 359	$ 3,080	$ 246
Aggregate intrinsic value exercisable	$ 246	$ 359	$ 3,080	$ 246