Commitments and Contingent Liabilities - Additional Information (Detail)	1 Months Ended	6 Months Ended
	Mar. 31, 2006 USD ($)	Jun. 30, 2016 USD ($) Plaintiff
Commitments And Contingencies Disclosure [Abstract]
Payment of past costs demand		$ 762,000
Number of parties named by Plaintiff | Plaintiff		60
Amount paid to settle suit	$ 45,000
Accrued liability from United States Environmental Protection Agency		$ 0