Residual Value Obligation and Deferred Lease Revenue (Detail) - Truck, Parts and Other - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Property Subject to or Available for Operating Lease [Line Items]
Residual value guarantees	$ 699.2	$ 691.4
Deferred lease revenues	373.4	356.0
Residual value guarantees and deferred revenues, Total	$ 1,072.6	$ 1,047.4