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Derivative Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
LIBOR period	3 months
Weighted average fixed rate	6.14%us-gaap_DerivativeAverageFixedInterestRate
Recorded period of effectiveness of cash flow hedges on net income	12 months
Recorded period of effectiveness of fair value hedges on net income	12 months
Recorded period of effectiveness of fair value of derivatives on net income	12 months
Cash Flow Hedging [Member]
Derivative [Line Items]
Notional amount of interest	30.5us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember	$ 30.5us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember
Derivative in Fair Value Hedging Relationship [Member]
Derivative [Line Items]
Notional amount of interest	102.7us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember	$ 95.3us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember

X

- Definition

Cash flow hedge derivatives expected period of insignificant impact on net income.

+ References

No definition available.

+ Details

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- Definition

Fair flow hedge derivatives expected period of insignificant impact on net income.

+ References

No definition available.

+ Details

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X

- Definition

LIBOR period.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Non designated hedge derivatives expected period of insignificant impact on net income.

+ References

No definition available.

+ Details

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X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

+ Details

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Period Type:	instant

X

- Definition

Average fixed interest rate related to the group of interest rate derivatives.

+ References

No definition available.

+ Details

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Period Type:	instant

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- Details

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- Details

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