Derivatives - Fair Value Measurements on Recurring Basis (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
2014 Swaps
Fair Value On Recurring Basis [Line Items]
Fair Value	$ (7,380)
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	(7,380)
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	(1,064)
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	(1,064)
2015 Swaps | Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3)
Fair Value On Recurring Basis [Line Items]
Fair Value	$ 0