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Fair Value Disclosures - Schedule of Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Fair Value of Financial Instruments [Line Items]    
Notes receivable from Preferred Operating Partnership unit holders $ 119,735 $ 120,230
Fixed rate notes payable and notes payable to trusts 3,829,564 3,738,497
Exchangeable senior notes 570,425 604,276
Fair Value    
Fair Value of Financial Instruments [Line Items]    
Notes receivable from Preferred Operating Partnership unit holders 111,322 113,683
Fixed rate notes receivable 0 20,942
Fixed rate notes payable and notes payable to trusts 2,835,283 2,774,242
Exchangeable senior notes 674,567 719,056
Carrying Value    
Fair Value of Financial Instruments [Line Items]    
Notes receivable from Preferred Operating Partnership unit holders 119,735 120,230
Fixed rate notes receivable 0 20,608
Fixed rate notes payable and notes payable to trusts 2,916,055 2,815,085
Exchangeable senior notes $ 586,550 $ 624,259