Derivative and Hedging Activities - Schedule of Fair Value of Our Interest Rate Derivatives as Well as Their Classification on Our Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Interest rate swaps - Asset	$ 852	$ 4,563
Interest rate swaps - Liability	$ (6,276)	$ (1,797)

Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant