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Tax Effects allocated to Accumulated Other Comprehensive Income (Loss) Components (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Other Comprehensive Income (Loss) [Line Items]      
Before-tax amount $ (268)us-gaap_OtherComprehensiveIncomeLossBeforeTax $ (262)us-gaap_OtherComprehensiveIncomeLossBeforeTax $ 14us-gaap_OtherComprehensiveIncomeLossBeforeTax
Tax expense (benefit) (89)us-gaap_OtherComprehensiveIncomeLossTax (86)us-gaap_OtherComprehensiveIncomeLossTax 4us-gaap_OtherComprehensiveIncomeLossTax
Net-of-tax amount $ (179)us-gaap_OtherComprehensiveIncomeLossNetOfTax $ (176)us-gaap_OtherComprehensiveIncomeLossNetOfTax $ 10us-gaap_OtherComprehensiveIncomeLossNetOfTax