Summary of Business and Basis of Presentation - Additional Information (Detail) bbl in Billions	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2015 USD ($)	Jun. 30, 2015 bbl	Dec. 31, 2014 USD ($)
Summary of Business and Accounting Policies [Line Items]
Number of reporting segments		3
Increase Decrease In Net Loss From Continuing Operations | $	$ 52,489		$ 85,120
Natural Gas Operations [Member]
Summary of Business and Accounting Policies [Line Items]
Annual distribution of natural gas		26.0
Natural gas customers		68,000
Marketing & Production Operations [Member]
Summary of Business and Accounting Policies [Line Items]
Annually market of natural gas		1.3
EWR Subsidiary [Member]
Summary of Business and Accounting Policies [Line Items]
Number of natural gas producing wells and gas gathering assets		160
Gross Percentage Of Working Interest		55.00%
Average Net Revenue Interest, Percentage		46.00%