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Fair Value of Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value of Financial Instruments [Line Items]
Interest rate	3.65%us-gaap_DebtInstrumentInterestRateEffectivePercentage	4.85%us-gaap_DebtInstrumentInterestRateEffectivePercentage
Notes payable, fair value	$ 886.4us-gaap_NotesPayableFairValueDisclosure	$ 828.7us-gaap_NotesPayableFairValueDisclosure
Notes payable, carrying value	784.8us-gaap_NotesPayable	789.9us-gaap_NotesPayable
Interest Rate Swap
Fair Value of Financial Instruments [Line Items]
Interest rate swap agreement, termination date	Jul. 01, 2020
Fair value of derivative liability	$ 3.2us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember

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Interest Rate Swap Agreement Termination Date

+ References

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

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-Number 210

-Section 02

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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-Publisher FASB

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Fair value portion of notes payable.

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