Commitments and Contingencies - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) MMBTU / d bbl / d
Commitments And Contingencies Disclosure [Line Items]
Transportation commitments future minimum transportation fees due to nine months change | $	$ 2,840,505
Period of transportation commitments future minimum transportation fees due to nine months change	15 years
Natural Gas | Minimum
Commitments And Contingencies Disclosure [Line Items]
Transportation and gathering commitments contingent upon pipeline construction or modification, term of contract	1 year
Oil and Gas Delivery Commitments and Contracts, Daily Production	1,500
Natural Gas | Maximum
Commitments And Contingencies Disclosure [Line Items]
Transportation and gathering commitments contingent upon pipeline construction or modification, term of contract	5 years
Oil and Gas Delivery Commitments and Contracts, Daily Production	50,560
Ethane
Commitments And Contingencies Disclosure [Line Items]
Oil and Gas Delivery Commitments and Contracts, Daily Production | bbl / d	20,000
Oil and gas delivery commitments, term	15 years