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Commitments and Contingencies - Additional Information (Detail)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Container
Sep. 30, 2018
USD ($)
Container
Tractor
Trailer
Commitments And Contingencies Disclosure [Abstract]    
Purchase contract units, containers | Container 3,670  
Number of containers received | Container   2,370
Number of containers expected to be received in remainder of fiscal year | Container   1,300
Purchase contract units tractors | Tractor   869
Cost of purchasing tractors | $   $ 107.2
Number of tractors received | Tractor   543
Number of tractors expected to be received in remainder of fiscal year | Tractor   326
Purchase contract units trailers | Trailer   760
Cost of purchasing trailers | $   $ 24.2
Number of trailers received | Trailer   477
Number of trailers expected to be received in remainder of fiscal year | Trailer   283