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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