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Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Aug. 21, 2008
Significant Of Accounting Policies [Line Items]
Lp Units Convertible Conversion Ratio	1
Net Income Attributable to Noncontrolling Interest		$ (2,510)	$ (1,804)	$ (1,693)
Principal amount of senior unsecured notes	$ 120,000				$ 120,000
Largest amount of tax benefit, percent	50.00%
Minimum
Significant Of Accounting Policies [Line Items]
Estimated useful lives of the assets, years	3 years
Fair value of awards vesting period, years	1 year
Maximum
Significant Of Accounting Policies [Line Items]
Estimated useful lives of the assets, years	7 years
Fair value of awards vesting period, years	5 years

This element represents the overall income (loss) from a disposal group that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items, which is apportioned to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This item includes the following (net of tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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