Contingencies - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Site Contingency [Line Items]
Environmental and legal losses, minimum	$ 21,800,000
Environmental and legal losses, maximum	42,400,000
Accrued liability for losses	21,800,000		$ 20,900,000
Cash outlays related to legal and environmental matters	300,000	$ 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	$ 2,400,000