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Capital Stock - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2008
Dec. 31, 2007
Changes In Equity And Comprehensive Income Line Items [Line Items]          
Common stock available for issuance, Authorized 48,000,000us-gaap_CommonStockSharesAuthorized 48,000,000us-gaap_CommonStockSharesAuthorized      
Preferred stock available for issuance 2,000,000us-gaap_PreferredStockSharesAuthorized 2,000,000us-gaap_PreferredStockSharesAuthorized      
Stock repurchase program       $ 23,100,000us-gaap_StockRepurchaseProgramAuthorizedAmount1 $ 5,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Extension of the repurchase period Sep. 19, 2014        
Repurchase of common stock 143,000us-gaap_TreasuryStockSharesAcquired 365,000us-gaap_TreasuryStockSharesAcquired      
Aggregate purchase prices common stock shares $ 967,000us-gaap_PaymentsForRepurchaseOfCommonStock $ 1,513,000us-gaap_PaymentsForRepurchaseOfCommonStock $ 2,643,000us-gaap_PaymentsForRepurchaseOfCommonStock    
Prior Stock Repurchase Program [Member]          
Changes In Equity And Comprehensive Income Line Items [Line Items]          
Extension of the repurchase period Sep. 25, 2015