Accounts Receivable - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Financing Receivables And Receivables Sold [Line Items]
Financing receivables	$ 9.9	$ 9.9	$ 2.6
Spain and Italy [Member]
Financing Receivables And Receivables Sold [Line Items]
Trade receivables sold without recourse	1.2	2.0	6.2
United States and Italy [Member]
Financing Receivables And Receivables Sold [Line Items]
Trade receivables sold with recourse	6.9	16.6	20.8
Sales-Type Lease [Member]
Financing Receivables And Receivables Sold [Line Items]
Financing receivables	7.8	7.8	1.3
Trade Receivables with Original Maturities in Excess of One Year [Member]
Financing Receivables And Receivables Sold [Line Items]
Financing receivables	$ 2.1	$ 2.1	$ 1.3