Derivative Instruments and Hedging Activities - Fair Value of Company's Derivative Financial Instruments Classification on Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivatives Fair Value [Line Items]
Liability Derivatives Fair Value	$ 22,808	$ 19,600
Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Liability Derivatives Fair Value	22,808	19,600
Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Liability Derivatives Fair Value		1,673
Forward Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Liability Derivatives Fair Value	$ 22,808	$ 17,927