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Derivative Instruments (Detail) - Designated as Hedging Instrument - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Interest rate swap agreements | Other short-term assets    
Derivative [Line Items]    
Derivative assets, Fair value $ 516  
Interest rate swap agreements | Other short-term liabilities    
Derivative [Line Items]    
Derivative liabilities, Fair value   $ 1,457
Interest rate swap agreements | Other long-term assets    
Derivative [Line Items]    
Derivative assets, Fair value   3,281
Interest rate cap agreements | Other long-term assets    
Derivative [Line Items]    
Derivative assets, Fair value $ 15,127 $ 13,934