Stock-Based Compensation - Schedule of Standard and Market-based Stock Options Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Standard stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning outstanding balance (in shares)	3,596,533	3,486,157	3,227,167
Granted (in shares)	815,794	525,840	604,620
Exercised (in shares)	(395,515)	(239,071)	(205,744)
Forfeited (in shares)	(344,541)	(116,425)	(102,454)
Expired (in shares)	(251,150)	(59,968)	(37,432)
Ending outstanding balance (in shares)	3,421,121	3,596,533	3,486,157
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price, beginning balance (in dollars per share)	$ 8.45	$ 8.30	$ 7.78
Weighted average exercise price, granted (in dollars per share)	7.85	10.15	10.32
Weighted average exercise price, exercised (in dollars per share)	6.48	6.82	6.34
Weighted average exercise price, forfeited (in dollars per share)	9.05	12.38	7.20
Weighted average exercise price, expired (in dollars per share)	8.87	13.75	10.19
Weighted average exercise price, ending balance (in dollars per share)	8.44	8.45	8.30
Weighted average fair value of options granted (in dollars per share)	$ 3.67	$ 4.56	$ 4.93
Aggregate intrinsic value of options exercised	$ 918	$ 1,186	$ 1,125
Market condition based stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning outstanding balance (in shares)	200,000	50,000	0
Granted (in shares)	75,000	150,000	50,000
Exercised (in shares)	0	0	0
Forfeited (in shares)	(50,000)	0	0
Expired (in shares)	0	0	0
Ending outstanding balance (in shares)	225,000	200,000	50,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price, beginning balance (in dollars per share)	$ 9.05	$ 11.94	$ 0.00
Weighted average exercise price, granted (in dollars per share)	9.00	8.09	11.94
Weighted average exercise price, exercised (in dollars per share)	0.00		0.00
Weighted average exercise price, forfeited (in dollars per share)	11.94		0.00
Weighted average exercise price, expired (in dollars per share)	0.00		0.00
Weighted average exercise price, ending balance (in dollars per share)	8.39	9.05	11.94
Weighted average fair value of options granted (in dollars per share)	$ 3.68	$ 3.64	$ 5.71
Aggregate intrinsic value of options exercised	$ 0		$ 0