Derivative Instruments and Hedging Activities - Fair Value of Company's Derivative Financial Instruments Classification on Unaudited Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Derivatives Fair Value [Line Items]
Liability Derivatives Fair Value	$ 44,779	$ 19,600
Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Liability Derivatives Fair Value	44,779	19,600
Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Liability Derivatives Fair Value	847	1,673
Forward Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Liability Derivatives Fair Value	$ 43,932	$ 17,927