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Fair Value of Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified			6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Interest Rate Swap
Fair Value of Financial Instruments [Line Items]
Long-term debt, fixed interest rate	4.10%	4.00%
Notes payable, fair value	$ 880.3	$ 848.1
Notes payable, carrying value	795.8	774.8
Fair value of derivative liability			$ 3.4
Interest rate swap agreement, termination date			Jul. 01, 2020

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 assets not subject to a master netting arrangement and not elected to be offset.

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