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Fair Value Measurements - Measurement of Assets and Liabilities at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps $ 2,714 $ 2,564
Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted Investments 1,687 2,021
Interest rate swaps 2,714 2,564
Foreign exchange forward contracts (60)  
Foreign exchange forward contracts   1,695
Fair Value Measurements, Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted Investments 1,687 2,021
Interest rate swaps 0 0
Foreign exchange forward contracts 0  
Foreign exchange forward contracts   0
Fair Value Measurements, Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted Investments 0 0
Interest rate swaps 2,714 2,564
Foreign exchange forward contracts (60)  
Foreign exchange forward contracts   1,695
Fair Value Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted Investments 0 0
Interest rate swaps 0 0
Foreign exchange forward contracts $ 0  
Foreign exchange forward contracts   $ 0