Derivative Instruments and Hedging Activities - Fair Value of Company's Derivative Financial Instruments Classification on Unaudited Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivatives Fair Value [Line Items]
Liability Derivatives Fair Value	$ 37,366	$ 19,600
Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Liability Derivatives Fair Value	37,366	19,600
Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Liability Derivatives Fair Value	1,544	1,673
Forward Interest Rate Swaps [Member] | Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Liability Derivatives Fair Value	$ 35,822	$ 17,927