Contingencies - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Site Contingency [Line Items]
Environmental and legal losses	$ 21,400,000		$ 20,900,000
Cash outlays related to legal and environmental matters	1,000,000	$ 2,300,000
VAT inflation, penalty and interest charges	$ 0
Wilmington Site [Member]
Site Contingency [Line Items]
Contribution for future response costs	5.00%
Payment of environmental response costs	$ 2,500,000
Minimum [Member]
Site Contingency [Line Items]
Environmental and legal losses	21,400,000
Maximum [Member]
Site Contingency [Line Items]
Environmental and legal losses	$ 42,400,000