Contingencies - Additional Information (Detail)	9 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($) States	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Site Contingency [Line Items]
Environmental and legal losses, minimum	$ 20,600,000
Environmental and legal losses, maximum	41,100,000
Accrued liability for losses	20,600,000		$ 22,000,000
Cash outlays related to legal and environmental matters	$ 2,300,000	$ 800,000
Number of states examining company unclaimed property records | States	7
Liability for unpaid claim and claim adjustment expense, claims paid			$ 3,500,000
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