Contingencies - Additional Information (Detail) $ in Millions		9 Months Ended	12 Months Ended
	Feb. 18, 2015 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($) Employee
Contingencies And Commitments [Line Items]
Estimated total costs to remediate property	$ 8.3
Accrual for reasonably estimable remediation cost		$ 3.2	$ 7.1
Amount spent to implement remedial action work plan		3.9
PrimeSource [Member]
Contingencies And Commitments [Line Items]
Number of employees, litigation filed | Employee			11
Litigation expenses		$ 2.5