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Financial Instruments - Summary of Outstanding Interest Rate Swap (Detail) (Interest Rate Swap [Member], Other Current and Non-Current Liabilities [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Interest Rate Swap [Member] | Other Current and Non-Current Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 25,000us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 $ 40,000us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Fair Value $ (126)us-gaap_InterestRateDerivativesAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember		 $ (452)us-gaap_InterestRateDerivativesAtFairValueNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember