Earnings Per Common Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share Disclosure [Line Items]
Weighted Average Number of Limited Partnership and General Partnership Unit Outstanding, Basic and Diluted	41,514	39,133
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest	$ 0	$ (65)
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest	159	83
Calculation of Earnings per Share - basic
Net income available for common shareholders	19,559	22,336
Earnings Per Share, Basic	$ 0.47	$ 0.57
Income from continuing operations available for common unitholders	$ 0.47	$ 0.32
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.00	$ 0.25
Calculation of Earnings per Share - diluted
Net income available for common shareholders	19,559	22,336
Net income attributable to noncontrolling interests	159	148
Net Income Attributable to Common Shareholders, Adjusted	19,559	12,542
Income from Discontinued Operations, Adjusted	$ 0	$ 9,794

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Income from Discontinued Operations, Adjusted

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Net Income Attributable to Common Unitholders, Adjusted

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

Amount of income (loss) from continuing operations attributable to the noncontrolling interest. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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The amount of net income (loss) from continuing operations per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares.

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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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The amount of net income or loss derived from discontinued operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The average number of limited partnership and general partnership units issued and outstanding that are used in calculating basic and diluted earnings per limited partnership and general partnership unit.

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