Financing Receivable - Additional Information (Detail) $ in Millions		12 Months Ended
	Feb. 27, 2015 EUR (€)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Trade Accounts And Financing Receivable [Line Items]
Proceeds from the transferred receivables		$ 11.3	$ 2.8
Factoring Facility | G E Capital
Trade Accounts And Financing Receivable [Line Items]
Credit facility amount | €	€ 50,000,000
Line of credit facility, expiration date		Jan. 15, 2019
Debt instrument, variable interest rate	1.65%
Debt, interest expense		$ 0.1	$ 0.1