Derivative Instruments and Hedging Activities - Earnings Effect of Derivative Instruments in Consolidated Statements of Operations and Consolidated Statements of Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Classification of Gain (Loss) Recognized	$ (4,309)	$ (3,127)
Cash Flow Hedges [Member] | Interest Rate Swap [Member] | Other Comprehensive Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Classification of Gain (Loss) Recognized	$ (4,309)	$ (3,127)
Non-Designated Hedges [Member] | Interest Rate Caps [Member] | Other Income (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Classification of Gain (Loss) Recognized			$ (135)