Accounts Receivable - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Financing Receivables And Receivables Sold [Line Items]
Financing receivables	$ 21.2	$ 14.8
United States and Italy [Member]
Financing Receivables And Receivables Sold [Line Items]
Trade receivables sold with recourse	5.2	23.2
Spain and Italy [Member]
Financing Receivables And Receivables Sold [Line Items]
Trade receivables sold without recourse	0.4	3.7
Sales-Type Lease [Member]
Financing Receivables And Receivables Sold [Line Items]
Financing receivables	11.0	10.2
Trade Receivables with Original Maturities in Excess of One Year [Member]
Financing Receivables And Receivables Sold [Line Items]
Financing receivables	$ 10.2	$ 4.6