Earnings Per Share - Additional Information (Detail) - shares	1 Months Ended	12 Months Ended
	May. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Weighted Average Shares Used In Computing Earnings Per Share [Line Items]
Antidilutive stock options outstanding (in shares)		145,000	205,000	242,000
Shares of common stock issued upon vesting of restricted stock (in shares)		418,000	384,000	358,000
IPO [Member]
Weighted Average Shares Used In Computing Earnings Per Share [Line Items]
Common stock issued (in shares)	5,750,000