Interest Rate Hedging - Financial Assets and Liabilities Valued on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative Assets - current	$ 388
Derivative Assets - non-current	368	$ 867
Derivative Liabilities - current	(2,098)
Derivative Liabilities - non-current	(1,673)	(1,298)
Derivative Assets and Liabilities, Total	(3,015)	(431)
Significant Other Observable Inputs Level 2 Member
Derivatives, Fair Value [Line Items]
Derivative Assets - current	388
Derivative Assets - non-current	368	867
Derivative Liabilities - current	(2,098)
Derivative Liabilities - non-current	(1,673)	(1,298)
Derivative Assets and Liabilities, Total	$ (3,015)	$ (431)