Commitments and Contingent Liabilities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	6 Months Ended
	Mar. 31, 2006	Jun. 30, 2014 Plaintiff
Commitments And Contingencies Disclosure [Abstract]
Payment of past costs demand		$ 762
Minimum period for clean-up of site		2 years
Number of parties named by Plaintiff		60
Accrued liability from United States Environmental Protection Agency		0
Amount paid to settle suit	$ 45