Commitments and Contingencies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2016 USD ($) Cases site Plaintiff	Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items]
Liable periods	twenty-year
Litigation settlement amount	$ 1,150,000,000
Recoveries receivable	0	$ 0
Accrued environmental obligations approximately	$ 115,665,000	$ 113,133,000
Sites associated with remediation | site	42
Loss contingency, maximum range of possible costs	$ 175,000,000
Currently not able to estimate a range of costs to sites | site	5
Product Liability And Occupational Exposure Litigation Claims
Loss Contingencies [Line Items]
Number of cases pending | Cases	102
Product Liability And Occupational Exposure Litigation Claims | Administratively Dismissed Claims
Loss Contingencies [Line Items]
Number of plaintiffs involved | Cases	8,692
Product Liability And Occupational Exposure Litigation Claims | Pending Claims
Loss Contingencies [Line Items]
Number of plaintiffs involved | Plaintiff	588
Minimum
Loss Contingencies [Line Items]
Number of cases settled and dismissed and found not liable | Cases	100