Commitments and Contingencies (Details) (USD $)	3 Months Ended
	Mar. 31, 2013 LinearFeet	Mar. 25, 2013 Case
Commitments and Contingencies (Additional Textual) [Abstract]
Installation of a reactive iron wall covering area	250
Estimated plan cost for initial construction	$ 688,000
Expected operation and maintenance expenses	$ 1,997,000
Estimated period	30 years
Unresolved cases		32
Massachusetts [Member]
Commitments and Contingencies (Textual) [Abstract]
Number of cases pending	234
Number of cases terminated	167
Settlement agreements, cases	35
Washington [Member]
Commitments and Contingencies (Textual) [Abstract]
Number of cases pending	1