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Earnings Per Share - Additional Information (Detail)
 12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 31, 2014
Weighted Average Shares Used In Computing Earnings Per Share [Line Items]        
Antidilutive stock options outstanding 205,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 242,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 347,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount  
Shares of common stock issued upon vesting of restricted stock 384,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross 358,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross 316,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross  
IPO [Member]        
Weighted Average Shares Used In Computing Earnings Per Share [Line Items]        
Common stock issued       5,750,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember