Impairment Charges and Impairment of Joint Venture Investments - Impairment Charges Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of joint venture investments	$ 1,909	$ 30,652	$ 980
Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unconsolidated joint venture investments, Fair Value Measurements	0	6,400	35,300
Long-lived assets held and used/held for sale, Fair Value Measurements	407,100	141,200	164,200
Long-lived assets held and used/held for sale, Total Losses	279,000	38,100	72,600
Impairment of joint venture investments	1,900	30,700	1,000
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/held for sale, Fair Value Measurements	0	0	0
Unconsolidated joint venture investments, Fair Value Measurements	0	0	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/held for sale, Fair Value Measurements	0	0	0
Unconsolidated joint venture investments, Fair Value Measurements	0	0	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/held for sale, Fair Value Measurements	407,100	141,200	164,200
Unconsolidated joint venture investments, Fair Value Measurements	$ 0	$ 6,400	$ 35,300