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Derivatives - Fair Value Measurements on Recurring Basis (Detail)
$ in Thousands
Mar. 31, 2016
USD ($)
2014 Swaps  
Fair Value on Recurring Basis [Line Items]  
Fair Value $ (11,808)
2014 Swaps | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)  
Fair Value on Recurring Basis [Line Items]  
Fair Value 0
2014 Swaps | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)  
Fair Value on Recurring Basis [Line Items]  
Fair Value (11,808)
2014 Swaps | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3)  
Fair Value on Recurring Basis [Line Items]  
Fair Value 0
2015 Swaps  
Fair Value on Recurring Basis [Line Items]  
Fair Value (9,131)
2015 Swaps | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)  
Fair Value on Recurring Basis [Line Items]  
Fair Value 0
2015 Swaps | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)  
Fair Value on Recurring Basis [Line Items]  
Fair Value (9,131)
2015 Swaps | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3)  
Fair Value on Recurring Basis [Line Items]  
Fair Value $ 0