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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]  
Summary of Estimated Useful Life of Fixed Assets

Depreciation for fixed assets is computed using the straight-line method over the following estimated useful lives:

 

    

Useful Life

Office equipment

   Three to ten years

Furniture and fixtures

   Three to ten years

Computer equipment

   Three to five years

Building

   Fifteen to forty years

Software

   Three to five years

Refined fuel plants

   Ten years

Leasehold improvements

   Shorter of the lease term or useful life of the asset