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Other Comprehensive Income - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Accumulated other comprehensive loss $ 557us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 695us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax