Water And Wastewater Rates (Details) (USD $)	0 Months Ended	6 Months Ended
	Jun. 07, 2012	Jun. 30, 2012
Water And Wastewater Rates [Line Items]
Authorized increase in revenue		$ 20,451,000
Infrastructure rehabilitation surcharge percentage, reset level upon new base rates		0.00%
Pennsylvania Operating Division [Member]
Water And Wastewater Rates [Line Items]
Authorized increase in revenue	16,700,000
Distribution system improvement charges	27,449,000
Distribution system improvement charges over base rate	7.50%
Base rate increase designed to increase total operating revenues on an annual basis	44,149,000
Distribution system improvement charges reset level upon new base rates	0
Infrastructure rehabilitation surcharges		2,764,000
Other Subsidiaries [Member]
Water And Wastewater Rates [Line Items]
Infrastructure rehabilitation surcharges		$ 1,390
Maximum [Member]
Water And Wastewater Rates [Line Items]
Infrastructure rehabilitation surcharges, capped percentage		9.00%
Minimum [Member]
Water And Wastewater Rates [Line Items]
Infrastructure rehabilitation surcharges, capped percentage		5.00%