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Other Comprehensive Income - Summary of Other Comprehensive Income (Loss) and Tax Impact (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Net unrealized gain (loss) on available-for-sale securities, net of income tax expense (benefit) of $71 and $(11), respectively $ 107us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax $ (33)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Net unrealized gain on interest rate swaps, net of income tax expense of $26 and $33, respectively 45us-gaap_DerivativeInstrumentsGainRecognizedInOtherComprehensiveIncomeEffectivePortion 56us-gaap_DerivativeInstrumentsGainRecognizedInOtherComprehensiveIncomeEffectivePortion
Foreign currency translation (14)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (14)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Total other comprehensive income $ 138us-gaap_OtherComprehensiveIncomeLossNetOfTax $ 9us-gaap_OtherComprehensiveIncomeLossNetOfTax