Acquisitions (Details 4) - Change in Accounting Estimate, Type [Domain] $ in Thousands		3 Months Ended
	Nov. 21, 2014 USD ($) item	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)
Estimated fair values of the assets acquired and liabilities assumed
Goodwill		$ 1,451,654	$ 1,402,761
Change
Goodwill		$ 1,973
Water treatment facilities and equipment | Minimum
Estimated fair values of the assets acquired and liabilities assumed
Useful life of property, plant and equipment		3 years
Water treatment facilities and equipment | Maximum
Estimated fair values of the assets acquired and liabilities assumed
Useful life of property, plant and equipment		30 years
Buildings and leasehold improvements | Minimum
Estimated fair values of the assets acquired and liabilities assumed
Useful life of property, plant and equipment		3 years
Buildings and leasehold improvements | Maximum
Estimated fair values of the assets acquired and liabilities assumed
Useful life of property, plant and equipment		40 years
Bakken Shale Play Water Solutions Facilities
Acquisitions
Number of businesses acquired | item	2
Total consideration paid	$ 34,600
Estimated fair values of the assets acquired and liabilities assumed
Goodwill		$ 6,721	6,560
Other noncurrent assets		75
Other noncurrent liabilities		(304)	(68)
Fair value of net assets acquired		34,600	34,600
Change
Goodwill		161
Other noncurrent assets		75
Other noncurrent liabilities		(236)
Bakken Shale Play Water Solutions Facilities | Customer relationships
Estimated fair values of the assets acquired and liabilities assumed
Intangible assets		$ 22,000	22,000
Useful life of intangible assets		6 years
Bakken Shale Play Water Solutions Facilities | Vehicles
Estimated fair values of the assets acquired and liabilities assumed
Property, plant and equipment		$ 63	63
Useful life of property, plant and equipment		10 years
Bakken Shale Play Water Solutions Facilities | Water treatment facilities and equipment
Estimated fair values of the assets acquired and liabilities assumed
Property, plant and equipment		$ 5,815	5,815
Bakken Shale Play Water Solutions Facilities | Water treatment facilities and equipment | Minimum
Estimated fair values of the assets acquired and liabilities assumed
Useful life of property, plant and equipment		3 years
Bakken Shale Play Water Solutions Facilities | Water treatment facilities and equipment | Maximum
Estimated fair values of the assets acquired and liabilities assumed
Useful life of property, plant and equipment		30 years
Bakken Shale Play Water Solutions Facilities | Buildings and leasehold improvements
Estimated fair values of the assets acquired and liabilities assumed
Property, plant and equipment		$ 130	130
Bakken Shale Play Water Solutions Facilities | Buildings and leasehold improvements | Minimum
Estimated fair values of the assets acquired and liabilities assumed
Useful life of property, plant and equipment		7 years
Bakken Shale Play Water Solutions Facilities | Buildings and leasehold improvements | Maximum
Estimated fair values of the assets acquired and liabilities assumed
Useful life of property, plant and equipment		30 years
Bakken Shale Play Water Solutions Facilities | Land
Estimated fair values of the assets acquired and liabilities assumed
Property, plant and equipment		$ 100	$ 100