Commitments and Contingent Liabilities - Additional Information (Detail)	1 Months Ended	9 Months Ended
	Mar. 31, 2006 USD ($)	Sep. 30, 2015 USD ($) Plaintiff
Commitments And Contingencies Disclosure [Abstract]
Payment of past costs demand		$ 762,000
Minimum period for clean-up of site		2 years
Number of parties named by Plaintiff | Plaintiff		60
Accrued liability from United States Environmental Protection Agency		$ 0
Amount paid to settle suit	$ 45,000