Residual Value Obligation and Deferred Lease Revenue (Detail) - Truck, Parts and Other - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Property Subject to or Available for Operating Lease [Line Items]
Residual value guarantees	$ 691.4	$ 629.1
Deferred lease revenues	356.0	341.8
Residual value guarantees and deferred revenues, Total	$ 1,047.4	$ 970.9