Earnings Per Common Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share Disclosure [Line Items]
Percentage of Consolidated Rental Revenue Generated by the Operating Partnership	90.40%	90.10%	90.30%	89.90%
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 32,496	$ 14,056	$ 33,189	$ 24,486
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	15,411	14,365	34,436	26,419
Weighted Average Number of Limited Partnership and General Partnership Unit Outstanding, Basic and Diluted	41,841	40,392	41,679	39,763
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest	(109)	(67)	(157)	136
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest	51	68	(162)	(147)
Calculation of Earnings per Share - basic
Net income available for common shareholders	47,747	28,286	67,306	50,622
Income from continuing operations available for common unitholders	$ 0.37	$ 0.35	$ 0.82	$ 0.66
Earnings Per Share, Basic and Diluted	$ 1.14	$ 0.70	$ 1.61	$ 1.27
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic and Diluted Share	$ 0.77	$ 0.35	$ 0.79	$ 0.61
Calculation of Earnings per Share - diluted
Net income available for common shareholders	47,747	28,286	67,306	50,622
Net income attributable to noncontrolling interests	160	135	319	283
Adjusted Income (loss) from continuing operations available for common unitholders, basic and diluted	15,360	14,297	34,274	26,272
Adjusted Income (loss) from discontinued operations available for common unitholders, basic and diluted	$ 32,387	$ 13,989	$ 33,032	$ 24,350

Adjusted Income (loss) from continuing operations available for common unitholders, basic and diluted

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Adjusted Income (loss) from discontinued operations available for common unitholders, basic and diluted

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Percentage of Consolidated Rental Revenue Generated by the Operating Partnership

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for 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 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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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

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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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Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, 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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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 income (loss) derived from discontinued operations during the period, net of related tax effect, 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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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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