Litigation - Schedule of Loss Contingencies by Contingency (Detail) (Asbestos Claims [Member], USD $)	3 Months Ended
	Mar. 31, 2014 Claim	Mar. 31, 2013 Claim
Asbestos Claims [Member]
Loss Contingencies [Line Items]
Total claims pending at the beginning of the period	8,319	8,007
New claims served	393	381
Claims dismissed	(56)	(106)
Claims settled	(55)	(55)
Total claims pending at the end of the period	8,601	8,227
Gross settlement and defense costs	$ 6,585,000	$ 6,087,000
Avg. gross settlement and defense costs per claim resolved	$ 59,320	$ 37,810