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Fair Value of Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Fair Value of Financial Instruments [Line Items]
Long-term debt, fixed interest rate	3.55%us-gaap_LongTermDebtPercentageBearingFixedInterestRate	3.65%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
Notes payable, fair value	$ 889.7us-gaap_NotesPayableFairValueDisclosure	$ 886.4us-gaap_NotesPayableFairValueDisclosure
Notes payable, carrying value	797.4us-gaap_NotesPayable	784.8us-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	$ 3.6us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember

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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.

+ References

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-Publisher FASB

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-Topic 825

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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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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