Derivative Instruments and Hedging Activity - Fair Value Interest Rate Swaps Designated as Cash Flow Hedging Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Other non-current assets
Fair Value interest rate swaps designated as cash flow hedging instruments
Fair Value (Derivative Asset and Liability)	$ 0	$ 516
Accrued expenses
Fair Value interest rate swaps designated as cash flow hedging instruments
Fair Value (Derivative Asset and Liability)	487	643
Deferred compensation and other liabilities
Fair Value interest rate swaps designated as cash flow hedging instruments
Fair Value (Derivative Asset and Liability)	$ 67	$ 10