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Aggregate Fair Value of Derivative Financial Instruments (Detail) - Fair Value, Measurements, Recurring - Interest Rate Swap - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Interest rate swap liability $ 21,129 $ 31,974
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Interest rate swap liability 0 0
Fair Value Measurements Using Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Interest rate swap liability 21,129 31,974
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Interest rate swap liability $ 0 $ 0