Shareholders' Equity - Summary of Stock Option (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity [Abstract]
Beginning balance of outstanding shares	1,727	1,807	1,244
Granted, Shares	286	280	923
Forfeitures, Shares	(106)	(121)	(44)
Exercised, Shares	(30)	(239)	(316)
Ending balance of outstanding, shares	1,877	1,727	1,807	1,244
Exercisable, Shares	977	655	557
Beginning Balance of Outstanding Weighted Average Exercise Price	$ 10.12	$ 9.05	$ 5.18
Granted, Weighted Average Exercise Price	11.55	13.78	12.72
Forfeitures, Weighted Average Exercise Price	12.31	12.45	9.83
Exercised, Weighted Average Exercise Price	4.47	5.18	4.41
Ending Balance of Outstanding Weighted Average Exercise Price	10.30	10.12	9.05	$ 5.18
Exercisable, Weighted Average Exercise Price	$ 8.48	$ 5.02	$ 5.76
Outstanding, Weighted Average Remaining Contractual Term	6 years 9 months 18 days	7 years 3 months 18 days	7 years 8 months 12 days	6 years 9 months 18 days
Exercisable, Weighted Average Remaining Contractual Term	5 years 4 months 24 days	5 years 9 months 18 days	5 years 2 months 12 days
Outstanding, Aggregate Intrinsic Value	$ 9,390	$ 12,830
Outstanding, Aggregate Intrinsic Value	1,769	9,390	$ 12,830
Exercisable, Aggregate Intrinsic Value	$ 1,765	$ 5,332	$ 5,786