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Discontinued Operations - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Proceeds from sale of business $ 1.5  
Waterloo [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Proceeds from sale of business   $ 14.0
Gain (loss) on sale of business, discontinued operations   $ 7.0
Discontinued operation beginning period   Jan. 01, 2014
Pre-tax loss on sale of discontinued operations   $ 16.9
Transaction and other sale-related costs of discontinued operation   2.8
Estimated tax effect on sale of discontinued operation   $ 26.5