Pension and Other Postretirement Employee Benefit Plans - Additional Information (Detail 1) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year		$ 0.0
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contribution				$ 0.2
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year				0.4
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contribution				0.0	$ 0.0
Cost of Sales
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	$ 0.1		$ 0.1	$ 0.3	0.8
Selling, General and Administrative Expenses
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	$ 0.1	$ 0.2	$ 0.1		$ 0.5