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Receivables - Narrative (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for financing notes   $ 7.7
Servicing [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for financing notes $ 64.4 $ 66.3