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Derivative Instruments (Detail) - Designated as Hedging Instrument - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Interest rate swap agreements | Other short-term assets    
Derivative [Line Items]    
Derivative assets, Fair value   $ 516
Interest rate cap agreements | Other long-term assets    
Derivative [Line Items]    
Derivative assets, Fair value $ 9,929 $ 15,127