Secured Notes Payable and Revolving Credit Facility, Net - Schedule of Debt Statistics (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Principal balance of consolidated fixed rate debt	$ 3,910,000
Weighted average remaining life (including extension options) of consolidated fixed rate debt (in years)	5 years 2 months
Weighted average remaining fixed interest period of consolidated fixed rate debt (in years)	2 years 6 months
Weighted average annual interest rate of consolidated fixed rate debt (as a percent)	3.07%
Debt Instrument [Line Items]
Principal Balance	$ 4,158,806	$ 4,163,982
Aggregate Swapped to Fixed Rate Loans
Debt Instrument [Line Items]
Principal Balance	3,882,400	3,882,400
Aggregate Fixed Rate Loans
Debt Instrument [Line Items]
Principal Balance	31,406	31,582
Aggregate Floating Rate Loans
Debt Instrument [Line Items]
Principal Balance	$ 245,000	$ 250,000