Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income by Component (Parenthetical) (Details) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	$ 1,760,000	$ 2,795,000	$ 3,972,000	$ 5,576,000
Unconsolidated Joint Ventures [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss)		$ 0	$ 0	$ 0	$ 0

[1] Net of amount attributable to the noncontrolling interests in the Operating Partnership.