Discontinued Operations - Balance Sheet Data for Discontinued Operations (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Summary of balance sheet data for discontinued operations
Other current assets	$ 300	$ 300
Total current assets associated with discontinued operations	300	300
Other assets, net	6,421	6,421
Deferred income taxes	6,536	6,842
Total assets associated with discontinued operations	13,257	13,563
Other current liabilities	297	297
Total current liabilities associated with discontinued operations	297	297
Deferred income taxes	6,421	6,421
Total liabilities associated with discontinued operations	6,718	6,718
Spinoff | Exterran Corporation
Summary of balance sheet data for discontinued operations
Other current assets	300	300
Total current assets associated with discontinued operations	300	300
Other assets, net	6,421	6,421
Deferred income taxes	0	0
Total assets associated with discontinued operations	6,721	6,721
Other current liabilities	297	297
Total current liabilities associated with discontinued operations	297	297
Deferred income taxes	6,421	6,421
Total liabilities associated with discontinued operations	6,718	6,718
Abandonment | Contract Water Treatment Business
Summary of balance sheet data for discontinued operations
Other current assets	0	0
Total current assets associated with discontinued operations	0	0
Other assets, net	0	0
Deferred income taxes	6,536	6,842
Total assets associated with discontinued operations	6,536	6,842
Other current liabilities	0	0
Total current liabilities associated with discontinued operations	0	0
Deferred income taxes	0	0
Total liabilities associated with discontinued operations	$ 0	$ 0