Segment Information - Summary of Information about Company's Reportable Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total revenues	$ 253,800	$ 257,135	$ 765,544	$ 773,283
Rental operation expenses	(68,169)	(73,348)	(213,075)	(223,529)
Net operating income (loss)	185,631	183,787	552,469	549,754
Impairment charges	(104,877)	0	(104,877)	(279,021)
Depreciation and amortization	(95,451)	(97,155)	(290,051)	(299,470)
Interest income	9,304	7,331	27,800	21,703
Other income (expense), net	(384)	(240)	3,470	(1,300)
Unallocated expenses	(73,123)	(76,341)	(222,110)	(243,987)
Equity in net (loss) income of joint ventures	(1,457)	648	14,081	2,351
(Loss) gain on sale and change in control of interests, net	(1,087)	0	(1,087)	7,772
(Loss) income from continuing operations	(81,444)	18,030	(20,305)	(242,198)
Total gross real estate assets	9,911,432	10,155,375	9,911,432	10,155,375
Notes receivable, net	44,823	47,430	44,823	47,430	$ 42,534
Operating Segments [Member] \| Shopping Center [Member]
Segment Reporting Information [Line Items]
Total revenues	253,787	257,109	765,514	773,162
Rental operation expenses	(68,107)	(73,280)	(212,857)	(223,425)
Net operating income (loss)	185,680	183,829	552,657	549,737
Impairment charges	(104,877)		(104,877)	(279,021)
Depreciation and amortization	(95,451)	(97,155)	(290,051)	(299,470)
Equity in net (loss) income of joint ventures	(1,457)	648	14,081	2,351
(Loss) gain on sale and change in control of interests, net	(1,087)		(1,087)	7,772
Total gross real estate assets	9,911,432	10,155,375	9,911,432	10,155,375
Operating Segments [Member] \| Loan Investments [Member]
Segment Reporting Information [Line Items]
Total revenues	13	26	30	121
Rental operation expenses	(62)	(68)	(218)	(104)
Net operating income (loss)	(49)	(42)	(188)	17
Interest income	9,304	7,331	27,800	21,703
Notes receivable, net	447,070	357,648	447,070	357,648
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Other income (expense), net	(384)	(240)	3,470	(1,300)
Unallocated expenses	(73,123)	(76,341)	(222,110)	(243,987)
Notes receivable, net	$ (402,247)	$ (310,218)	$ (402,247)	$ (310,218)

This element represents aggregate operating expenses including common area maintenance and real estate taxes.

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- Definition

Amount of total gross real estate assets attributed to the reportable segment.

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This element represents expenses consisting of general and administrative, interest expense and tax benefit/expense.

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Amount of interest income earned from interest bearing assets classified as other.

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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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The net result for the period of deducting operating expenses from operating revenues.

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Amount of income (expense) related to nonoperating activities, classified as other.

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The aggregate revenue from real estate operations during the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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