Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Total property, plant and equipment	$ 267,692	$ 258,244
Less accumulated depreciation	(71,367)	(64,092)
Net property, plant and equipment	196,325	194,152
Mains/Lines/Sewers
Property Plant And Equipment [Line Items]
Total property, plant and equipment	$ 115,593	113,318
Property plant and equipment, average depreciation life	47 years
Plant
Property Plant And Equipment [Line Items]
Total property, plant and equipment	$ 67,748	64,983
Property plant and equipment, average depreciation life	25 years
Equipment
Property Plant And Equipment [Line Items]
Total property, plant and equipment	$ 29,038	27,961
Property plant and equipment, average depreciation life	10 years
Meters
Property Plant And Equipment [Line Items]
Total property, plant and equipment	$ 4,572	4,253
Property plant and equipment, average depreciation life	12 years
Furniture, Fixture and Leasehold Improvements
Property Plant And Equipment [Line Items]
Total property, plant and equipment	$ 386	386
Property plant and equipment, average depreciation life	8 years
Computer and Office Equipment
Property Plant And Equipment [Line Items]
Total property, plant and equipment	$ 1,100	1,022
Property plant and equipment, average depreciation life	5 years
Software
Property Plant And Equipment [Line Items]
Total property, plant and equipment	$ 244	177
Property plant and equipment, average depreciation life	3 years
Land and Land Rights
Property Plant And Equipment [Line Items]
Total property, plant and equipment	$ 752	752
Other
Property Plant And Equipment [Line Items]
Total property, plant and equipment	140	148
Construction Work-In-Process
Property Plant And Equipment [Line Items]
Total property, plant and equipment	$ 48,119	$ 45,244