Litigation - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended
	Feb. 24, 2011 Defendant Company	Dec. 31, 2014	Feb. 24, 2011 Defendant
Commitments and Contingencies Disclosure [Abstract]
Number of domestic insurance companies, lawsuit filed against	13
Number of defendant insurers in the coverage action			2
Number of domestic defendant insurers in action	8
Number of domestic insurance companies, remain in litigation	2
Reserves for total costs for asbestos liability claims pending or projected		$ 189,048
Percentage attributable to settlement costs for unasserted claims projected to be filed		64.00%
Insurance recoveries receivable		$ 140,651