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Summary of Preliminary Allocation of Total Purchase Price to Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Jul. 01, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 348,506   $ 262,376
Estenson Logistics, LLC [Member]      
Business Acquisition [Line Items]      
Cash and cash equivalents   $ 12  
Accounts receivable trade   27,000  
Accounts receivable other   165  
Prepaid expenses and other current assets   1,500  
Property and equipment   128,477  
Other intangibles   66,400  
Goodwill   86,294  
Other assets   64  
Total assets acquired   309,912  
Accounts payable trade   4,542  
Accrued payroll   5,661  
Accrued other   15,018  
Equipment debt assumed   112,677  
Total liabilities assumed   137,898  
Total consideration   $ 172,014