Other Current Liabilities - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Payables And Accruals [Abstract]
Pre-tax restructuring expense	$ 2.9
Cumulative costs incurred to date on restructuring	2.0
Accrued in other current liabilities related to restructuring	1.0	$ 1.5
Increase in estimated restructuring costs to be incurred	0.1
Additional payments for restructuring	$ 0.6