Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Detail) - Swaps	Mar. 31, 2016 MMBTU / d bbl / d $ / MMBTU $ / bbl $ / gal
Natural Gas | 2016
Derivative [Line Items]
Volume Hedged | MMBTU / d	760,000
Weighted Average Hedge Price | $ / MMBTU	3.22
Natural Gas | 2017
Derivative [Line Items]
Volume Hedged | MMBTU / d	155,000
Weighted Average Hedge Price | $ / MMBTU	2.82
Natural Gas | 2018
Derivative [Line Items]
Volume Hedged | MMBTU / d	27,500
Weighted Average Hedge Price | $ / MMBTU	2.84
Crude Oil | 2016
Derivative [Line Items]
Volume Hedged	5,498
Weighted Average Hedge Price | $ / bbl	59.74
Crude Oil | 2017
Derivative [Line Items]
Volume Hedged	1,000
Weighted Average Hedge Price | $ / bbl	50.13
Commodity Contract NGLs (C3 - Propane) | 2016
Derivative [Line Items]
Volume Hedged	5,500
Weighted Average Hedge Price | $ / gal	0.60
Commodity Contract NGLs (NC4 - Normal Butane) | 2016
Derivative [Line Items]
Volume Hedged	3,750
Weighted Average Hedge Price | $ / gal	0.66
Commodity Contract NGLs (C5 - Natural Gasoline) | 2016
Derivative [Line Items]
Volume Hedged	3,417
Weighted Average Hedge Price | $ / gal	1.12
Commodity Contract NGLs (C5 - Natural Gasoline) | 2017
Derivative [Line Items]
Volume Hedged	750
Weighted Average Hedge Price | $ / gal	0.91