Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative [Line Items]
Change in value of interest rate swaps	$ (7,238,000)	$ 14,079,000
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Change in value of interest rate swaps	(9,026,000)	$ 14,551,000
Estimated accumulated other comprehensive income (loss) reclassified to interest expense in the next twelve months	5,966,000
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | 1633 Broadway [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Aggregate notional amount	1,000,000,000
Designated as Hedging Instrument [Member] | Interest Rate Swap March Two Thousand Eighteen [Member] | 1633 Broadway [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Aggregate notional amount	$ 400,000,000