Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions						12 Months Ended
	Nov. 15, 2017	Nov. 09, 2017	Jul. 24, 2017	Jun. 30, 2017	Jul. 25, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Feb. 07, 2018	Jan. 08, 2018	Nov. 27, 2017	Jun. 05, 2017
Other Commitments [Line Items]
Total rent expense						$ 13.8	$ 9.9	$ 8.2
Loans And Leases Receivable, Commitments, Fixed Rates, State Rate					7.00%
Interest rate on borrowings at LIBOR plus						1.75%
Software				$ 50.0
Software term				3 years
Minimum purchase amount commitment											$ 305.2
Commitments To Purchase Convertible Promissory Notes With Privately Held Company [Member]
Other Commitments [Line Items]
Other commitment						$ 5.0
Other Commitments, Future Minimum Payments, Remainder of Fiscal Year						2.0						$ 2.0
Other Commitment, Due in Second Year						$ 1.0
Interest rate on borrowings at LIBOR plus						2.50%
SDC
Other Commitments [Line Items]
Loans And Leases Receivable, Borrowing Base As A Percentage Of Accounts Receivable					80.00%
Maximum | SDC
Other Commitments [Line Items]
Loans and Leases Receivable, Commitments, Fixed Rates			$ 30.0		$ 15.0
SDC
Other Commitments [Line Items]
Loan receivable						$ 30.0
Belen Business Center
Other Commitments [Line Items]
Consideration transferred			$ 26.1
Deposit						20.9
Ziyang, China
Other Commitments [Line Items]
Committed investment minimum		$ 46.0
Costa Rica
Other Commitments [Line Items]
Consideration transferred	$ 25.6
Deposit						$ 6.8
Subsequent Event
Other Commitments [Line Items]
Deposit										$ 5.2
Subsequent Event | SDC
Other Commitments [Line Items]
Loan receivable									$ 30.0