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Investment in Piceance Energy Change in Equity Investment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	$ 104,657us-gaap_EquityMethodInvestments
Equity loss from Piceance Energy	(1,826)	(221)
Ending balance	116,595us-gaap_EquityMethodInvestments
Piceance Energy [Member]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance	104,657
Equity loss from Piceance Energy	(2,032)
Accretion of basis difference	206
Capital contributions	13,764
Ending balance	$ 116,595

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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