Business Segments - Segment Reporting, Reconciliation of Revenues, Operating Income and Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total revenues	$ 462,847us-gaap_RealEstateRevenueNet	$ 434,682us-gaap_RealEstateRevenueNet
General and administrative expenses	(56,288)us-gaap_GeneralAndAdministrativeExpense	(63,203)us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization	(169,808)us-gaap_DepreciationAndAmortization	(160,280)us-gaap_DepreciationAndAmortization
Earnings from unconsolidated entities, net	31,042	29,746
Interest expense	(68,761)us-gaap_InterestExpense	(85,523)us-gaap_InterestExpense
Interest and other income, net	11,049us-gaap_OtherNonoperatingIncomeExpense	14,050us-gaap_OtherNonoperatingIncomeExpense
Gains on acquisitions and dispositions of investments in real estate, net	277,715	17,055
Foreign currency and derivative gains (losses) and related amortization, net	34,566	(28,184)
Gains (losses) on early extinguishment of debt, net	(16,289)	273
Consolidated net earnings	351,312us-gaap_ProfitLoss	12,003us-gaap_ProfitLoss
Investments in and advances to unconsolidated entities	4,559,721		4,824,724
Assets held for sale	337,229		43,934
Cash and cash equivalents	192,013	188,886	350,692	491,129
Earnings before income taxes	353,203	18,883
Total assets	25,460,821us-gaap_Assets		25,818,223us-gaap_Assets
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	462,847	434,682
Consolidated net earnings	309,977	294,949
Total assets	19,715,241		20,258,013
Operating Segments [Member] \| Real Estate Operations [Member]
Segment Reporting Information [Line Items]
Total revenues	420,822	389,372
Consolidated net earnings	288,313	273,802
Total assets	19,641,549		20,180,083
Operating Segments [Member] \| Investment Management [Member]
Segment Reporting Information [Line Items]
Total revenues	42,025	45,310
Consolidated net earnings	21,664	21,147
Total assets	73,692		77,930
Operating Segments [Member] \| Americas [Member] \| Real Estate Operations [Member]
Segment Reporting Information [Line Items]
Total revenues	390,630	356,125
Consolidated net earnings	269,891	253,461
Total assets	17,151,143		17,432,909
Operating Segments [Member] \| Americas [Member] \| Investment Management [Member]
Segment Reporting Information [Line Items]
Total revenues	14,926	14,575
Consolidated net earnings	4,891	2,056
Total assets	20,317		20,635
Operating Segments [Member] \| Europe [Member] \| Real Estate Operations [Member]
Segment Reporting Information [Line Items]
Total revenues	18,769	16,188
Consolidated net earnings	10,938	8,224
Total assets	1,540,652		1,820,529
Operating Segments [Member] \| Europe [Member] \| Investment Management [Member]
Segment Reporting Information [Line Items]
Total revenues	18,393	21,700
Consolidated net earnings	11,865	13,684
Total assets	50,848		54,577
Operating Segments [Member] \| Asia [Member] \| Real Estate Operations [Member]
Segment Reporting Information [Line Items]
Total revenues	11,423	17,059
Consolidated net earnings	7,484	12,117
Total assets	949,754		926,645
Operating Segments [Member] \| Asia [Member] \| Investment Management [Member]
Segment Reporting Information [Line Items]
Total revenues	8,706	9,035
Consolidated net earnings	4,908	5,407
Total assets	2,527		2,718
Reconciling Items [Member]
Segment Reporting Information [Line Items]
General and administrative expenses	(56,288)	(63,203)
Depreciation and amortization	(169,808)	(160,280)
Earnings from unconsolidated entities, net	31,042	29,746
Interest expense	(68,761)	(85,523)
Interest and other income, net	11,049	14,050
Gains on acquisitions and dispositions of investments in real estate, net	277,715	17,055
Foreign currency and derivative gains (losses) and related amortization, net	34,566	(28,184)
Gains (losses) on early extinguishment of debt, net	(16,289)	273
Consolidated net earnings	43,226	(276,066)
Investments in and advances to unconsolidated entities	4,559,721		4,824,724
Assets held for sale	337,229		43,934
Note receivable backed by real estate	197,500
Cash and cash equivalents	192,013		350,692
Other assets	459,117		340,860
Total assets	$ 5,745,580		$ 5,560,210

Amount before tax of gain (loss) on foreign currency and derivative transactions, net of their related amortization.

No definition available.

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The amounts due from customers or clients to be paid at a certain time backed by real estate investment property and other.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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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 classified as other assets attributable to disposal group held for sale or disposed of.

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The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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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 from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and 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 the cost of borrowed funds accounted for as interest expense.

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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

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