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Fair Value Disclosures - Schedule of Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Fair Value of Financial Instruments [Line Items]    
Notes receivable from Preferred Operating Partnership unit holders $ 120,230 $ 120,230
Fixed rate notes payable and notes payable to trusts 3,429,153 3,213,588
Exchangeable senior notes 614,173 610,314
Fair Value [Member]    
Fair Value of Financial Instruments [Line Items]    
Notes receivable from Preferred Operating Partnership unit holders 114,593 125,642
Fixed rate notes receivable 21,553 53,450
Fixed rate notes payable and notes payable to trusts 2,648,758 2,404,996
Exchangeable senior notes 692,462 706,827
Carrying Value [Member]    
Fair Value of Financial Instruments [Line Items]    
Notes receivable from Preferred Operating Partnership unit holders 120,230 120,230
Fixed rate notes receivable 20,608 52,201
Fixed rate notes payable and notes payable to trusts 2,663,207 2,417,558
Exchangeable senior notes $ 638,170 $ 638,170