Fair Value Measures and Other Financial Instruments - Schedule of Effect of Interest Rate Swaps Designated as Cash Flow Hedges (Detail) - Cash Flow Hedging [Member] - Interest Rate Swap [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income	$ (2,252)	$ 1,109	$ (5,096)	$ (2,454)
Loss reclassified from accumulated other comprehensive income (loss) into interest expense	$ (1,032)	$ (1,058)	$ (3,081)	$ (3,134)