Stock-Based Compensation - Summary of Weighted Average Assumptions Used In Valuing Options (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Risk free interest rate	1.54%	1.58%	0.80%
Expected life in years	4 years 6 months	4 years 6 months	4 years 6 months
Expected volatility	40.82%	44.33%	58.50%