Commitments and Contingencies - Additional Information (Detail) $ in Millions	1 Months Ended	3 Months Ended
	Nov. 30, 2016 Container	Mar. 31, 2018 USD ($) Tractor Trailer Container	Apr. 30, 2018 Tractor Trailer
Loss Contingencies [Line Items]
Purchase contract units, containers | Container	4,000
Number of containers received | Container		2,947
Number of containers expected to be received in remainder of fiscal year | Container		1,053
Purchase contract units tractors | Tractor		787
Cost of purchasing tractors | $		$ 98.5
Number of tractors expected to be received in remainder of fiscal year | Tractor		733
Purchase contract units trailers | Trailer		535
Cost of purchasing trailers | $		$ 16.9
Number of trailers expected to be received in remainder of fiscal year | Trailer		525
Subsequent Event [Member]
Loss Contingencies [Line Items]
Number of tractors received | Tractor			54
Number of trailers received | Trailer			10