Nature of Operations - Additional Information (Detail)	Aug. 20, 2018 Facility Segment	Aug. 19, 2018 Segment	Aug. 31, 2018 Vehicle
Organization and Nature of Operations [Line Items]
Number of reportable segments | Segment	3	4
Number of railcars repair shops returned to business | Facility	12
Leasing & Services
Organization and Nature of Operations [Line Items]
Number of railcars owned			8,100
Number of railcars that get services			357,000
Leasing & Services | Equipment on operating leases, net
Organization and Nature of Operations [Line Items]
Number of railcars owned			6,300
Leasing & Services | Leased railcars for syndication
Organization and Nature of Operations [Line Items]
Number of railcars owned			1,600
Leasing & Services | Inventory Finished Goods
Organization and Nature of Operations [Line Items]
Number of railcars owned			200