Interest Rate Swaps - Impact of Interest Rate Swaps on Consolidated Statements of Operations - (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2018
Derivative [Line Items]
Total interest expense presented in the Consolidated Statement of Operations in which the effects of cash flow hedges are recorded (line item “Interest expense”)	$ 7,449	$ 6,471
Increase in interest expense	(7,500)
Interest Rate Swap
Derivative [Line Items]
Total interest expense presented in the Consolidated Statement of Operations in which the effects of cash flow hedges are recorded (line item “Interest expense”)	7,449		$ 6,471
Interest Rate Swap | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Derivative [Line Items]
Amount of loss recognized in AOCI on derivatives	(15,398)		(4,275)
Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Swap | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Derivative [Line Items]
Amount of (loss) gain reclassified from AOCI into earnings under “Interest expense”	$ (430)		$ 852