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Derivative Financial Instruments - Effect of Derivative Instruments on Consolidated Statement of Earnings (Detail) (Derivatives not designated as hedging instruments [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivatives, Fair Value [Line Items] |  |  |
Amount of Gain Recognized in Income on Derivative Instruments | $ 133 us-gaap_DerivativeGainOnDerivative | $ 0 us-gaap_DerivativeGainOnDerivative | $ 1,252 us-gaap_DerivativeGainOnDerivative
Interest rate swaps [Member] | Other Income [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Amount of Gain Recognized in Income on Derivative Instruments | $ 133 us-gaap_DerivativeGainOnDerivative / us-gaap_FairValueByAssetClassAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | $ 0 us-gaap_DerivativeGainOnDerivative / us-gaap_FairValueByAssetClassAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | $ 1,252 us-gaap_DerivativeGainOnDerivative / us-gaap_FairValueByAssetClassAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember

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- Definition Amount of increase in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
Name: | us-gaap_DerivativeGainOnDerivative
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_DerivativesFairValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration