Derivatives - Fair Value Measurements on Recurring Basis (Detail) $ in Thousands	Jun. 30, 2016 USD ($)
2014 Swaps
Fair Value on Recurring Basis [Line Items]
Fair Value	$ (13,318)
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	(13,318)
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	(12,742)
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	(12,742)
2015 Swaps | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3)
Fair Value on Recurring Basis [Line Items]
Fair Value	$ 0