Litigation - Schedule of Loss Contingencies by Contingency (Detail) - Asbestos Claims [Member]	3 Months Ended
	Mar. 31, 2016 USD ($) Claim	Mar. 31, 2015 USD ($) Claim
Loss Contingencies [Line Items]
Total claims pending at the beginning of the period	6,212	8,457
New claims served	397	372
Claims dismissed	(90)	(311)
Claims settled	(80)	(120)
Total claims pending at the end of the period	6,439	8,398
Gross settlement and defense costs | $	$ 4,027,000	$ 5,083,000
Avg. gross settlement and defense costs per claim resolved | $	$ 23,690	$ 11,790