Summary of Total Purchase Price Allocated to Net Assets Acquired (Detail) - Estenson Logistics, LLC [Member] $ in Thousands	Jul. 01, 2017 USD ($)
Business Acquisition [Line Items]
Cash paid	$ 165,945
Consideration payable	1,081
Contingent consideration, fair value	4,703
Total consideration	171,729
Equipment debt assumed	112,962
Total base purchase price	$ 284,691