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Impairment Charges, Impairment of Joint Venture Investments and Reserves - Impairment Charges Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment of joint venture investments | $ 0 | $ 0 | $ 1,909
Fair Value Measurements [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Long-lived assets held and used, Fair Value Measurements | 1,556,100 | 438,200 | 407,100
Preferred equity interests, Fair Value Measurements | 272,000 |  |
Unconsolidated joint venture investments, Fair Value Measurements |  |  | 0
Long-lived assets held and used, Total Impairment Charges | 340,500 | 110,900 | 279,000
Preferred equity interests, Total Impairment Charges | 61,000 |  |
Impairment of joint venture investments |  |  | 1,900
Fair Value Measurements [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Long-lived assets held and used, Fair Value Measurements | 0 | 0 | 0
Preferred equity interests, Fair Value Measurements | 0 |  |
Unconsolidated joint venture investments, Fair Value Measurements |  |  | 0
Fair Value Measurements [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Long-lived assets held and used, Fair Value Measurements | 0 | 0 | 0
Preferred equity interests, Fair Value Measurements | 0 |  |
Unconsolidated joint venture investments, Fair Value Measurements |  |  | 0
Fair Value Measurements [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Long-lived assets held and used, Fair Value Measurements | 1,556,100 | $ 438,200 | 407,100
Preferred equity interests, Fair Value Measurements | $ 272,000 |  |
Unconsolidated joint venture investments, Fair Value Measurements |  |  | $ 0

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=99375318&loc=d3e32787-111569 + Details
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