Commitments and Contingencies - Additional Information (Detail) $ in Millions	1 Months Ended		2 Months Ended	3 Months Ended	10 Months Ended	12 Months Ended
	Dec. 31, 2010 USD ($)	Mar. 31, 2010 USD ($)	Jan. 31, 2011 USD ($) Assessment	Jun. 30, 2015 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Commitments And Contingencies [Line Items]
Lease expense incurred						$ 6.0	$ 5.0	$ 5.1
2018						3.9
2019						2.2
2020						1.8
2021						0.9
2022						0.8
Thereafter						$ 6.2
Brazil
Commitments And Contingencies [Line Items]
Tax assessment settled with payments	$ 3.9	$ 12.2
Amount of interest, penalties and monetary restatement fees on tax assessments					$ 7.8
Tax credits certified				$ 8.3
Number of tax assessments | Assessment			2
Value of assessments served on Brazilian subsidiary			$ 13.0
Court deposit							$ 5.7		$ 3.1
Brazil | Inflation Related Credits
Commitments And Contingencies [Line Items]
Tax credits certified				$ 2.3