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Investment in Quest Resource Management Group, LLC - Total Purchase Price for Quest (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014
Business Combination Increase Decrease To Reflect Liabilities Acquired At Fair Value [Abstract]
Consideration paid for Quest Interests	$ 77,000,000
Non-controlling interest in the acquiree at the acquisition date fair value	27,050,000
Total consideration	$ 104,050,000

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination.

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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

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