Property, Pland and Equipment - Additional Information (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Property, Plant and Equipment
Impairment	$ 687,000	$ 0	$ 16,330,000	$ 0
Drilling Assets
Property, Plant and Equipment
Impairment	500,000		11,100,000
Assets held-for-sale	6,200,000		6,200,000
Corporate Asset
Property, Plant and Equipment
Impairment			2,900,000
Assets held-for-sale	17,000,000		17,000,000
Midstream Pipe Inventory and Natural Gas Compressors
Property, Plant and Equipment
Impairment	$ 200,000		$ 2,300,000