Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) Employee
Contingencies And Commitments [Line Items]
Amount paid to implement remedial action work plan	$ 0.3
Accrual for reasonably estimable remediation cost	$ 3.2
PrimeSource [Member]
Contingencies And Commitments [Line Items]
Number of employees, litigation filed | Employee	11
Litigation expenses	$ 0.7