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Investments in Unconsolidated Subsidiaries - Schedule of Condensed Financial Information of Equity Method Investments (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Equity Method Investments [Line Items] |  |  |
Current assets | $ 3,931,111 | $ 4,385,869 |
Non-current assets | 16,578,905 | 15,548,581 |
Assets | 20,510,016 | 19,934,450 |
Current liabilities | 1,919,955 | 2,032,227 |
Non-current liabilities | 4,495,117 | 4,466,814 |
Liabilities | 6,415,072 | 6,499,041 |
Non-controlling interests | 261,654 | 83,579 |
Revenue | 1,524,685 | 1,392,590 | $ 1,426,202
Operating income | 906,889 | 1,425,824 | 527,871
Net income | 679,712 | 1,254,345 | 418,751
Global Investment Management [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Current assets | 824,884 | 1,304,249 |
Non-current assets | 16,296,613 | 15,369,496 |
Assets | 17,121,497 | 16,673,745 |
Current liabilities | 409,014 | 526,777 |
Non-current liabilities | 4,423,313 | 4,354,825 |
Liabilities | 4,832,327 | 4,881,602 |
Non-controlling interests | 261,654 | 83,579 |
Revenue | 1,199,641 | 1,108,125 | 1,184,573
Operating income | 641,150 | 972,493 | 209,230
Net income | 463,560 | 833,189 | 122,560
Development Services [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Current assets | 3,058,166 | 2,995,449 |
Non-current assets | 99,728 | 102,508 |
Assets | 3,157,894 | 3,097,957 |
Current liabilities | 1,478,461 | 1,451,239 |
Non-current liabilities | 67,913 | 110,649 |
Liabilities | 1,546,374 | 1,561,888 |
Revenue | 124,175 | 104,816 | 85,594
Operating income | 254,191 | 427,407 | 292,141
Net income | 204,619 | 395,697 | 269,841
Other [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Current assets | 48,061 | 86,171 |
Non-current assets | 182,564 | 76,577 |
Assets | 230,625 | 162,748 |
Current liabilities | 32,480 | 54,211 |
Non-current liabilities | 3,891 | 1,340 |
Liabilities | 36,371 | 55,551 |
Revenue | 200,869 | 179,649 | 156,035
Operating income | 11,548 | 25,924 | 26,500
Net income | $ 11,533 | $ 25,459 | $ 26,350

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- Definition This item represents the disclosure of summarized financial information for unconsolidated subsidiaries and 50 percent-or-less owned entities accounted for using the equity method of accounting. If investments in common stock of corporate joint ventures or other investments accounted for under the equity method are, in the aggregate, material in relation to the financial position or results of operations of an investor, it may be necessary to present summarized information as to assets of the investee, or group of investments for which combined disclosure is appropriate, either by individual financial statement caption or in groups, as appropriate. Such summarized financial information may, at a minimum, include operating profit/loss. + References No definition available. + Details
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