Derivative Instruments and Hedging Activities - Fair Value of Company's Derivative Financial Instruments Classification on Unaudited Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Liability Derivatives Fair Value	$ 3,100
Other Assets [Member]
Derivatives Fair Value [Line Items]
Assets Derivatives Fair Value		$ 3,100
Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Liability Derivatives Fair Value	$ 3,109
Interest Rate Swaps [Member] | Other Assets [Member]
Derivatives Fair Value [Line Items]
Assets Derivatives Fair Value		$ 3,109