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Fair Value Disclosures - Schedule of Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 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 4,104,955 3,738,497
Exchangeable senior notes 560,613 604,276
Fair Value    
Fair Value of Financial Instruments [Line Items]    
Notes receivable from Preferred Operating Partnership unit holders 112,826 113,683
Fixed rate notes receivable 0 20,942
Fixed rate notes payable and notes payable to trusts 3,469,014 2,774,242
Exchangeable senior notes 617,125 719,056
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 3,573,996 2,815,085
Exchangeable senior notes $ 575,000 $ 624,259