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Variable Interest Entities - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Variable Interest Entity [Line Items]      
Payments to Acquire Additional Interest in Subsidiaries $ 7,971us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries $ 0us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries $ 0us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries
Deferred Tax Assets, Net 40,624us-gaap_DeferredTaxAssetsLiabilitiesNet 40,398us-gaap_DeferredTaxAssetsLiabilitiesNet  
Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Count of VIEs 4for_CountofVIEs
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
   
Variable Interest Entity, Non consolidated, Carrying amount, Assets 64,311us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
   
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities 79,723us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountLiabilities
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
   
Variable Interest Entity, Financial or Other Support, Amount 4,415us-gaap_VariableInterestEntityFinancialOrOtherSupportAmount
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
   
Maximum Exposure to loss related to VIEs 3,597us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
   
Investment in VIEs 9,500us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssetsAndLiabilitiesNet
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
   
Noncontrolling Interest [Member]      
Variable Interest Entity [Line Items]      
Deferred Tax Assets, Net 1,729us-gaap_DeferredTaxAssetsLiabilitiesNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Borrowings [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities $ 30,667us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_BorrowingsMember
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember