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Discontinued Operations (Details) (USD $)
 1 Months Ended 3 Months Ended
Aug. 31, 2012
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Summary of operating results of the discontinued operations        
Revenue     $ 12,309,000  
Expenses and selling, general and administrative   197,000 12,314,000  
Loss (recovery) attributable to expropriation and impairments   (16,421,000) (31,123,000)  
Other (income) loss, net   (2,533,000) (2,559,000)  
Provision for (benefit from) income taxes   30,000 161,000  
Income (loss) from discontinued operations, net of tax   18,727,000 33,516,000  
Summary of balance sheet data for discontinued operations        
Cash   69,000   74,000
Accounts receivable   217,000   288,000
Inventory   50,000   50,000
Other current assets   22,000   30,000
Total current assets associated with discontinued operations   358,000   442,000
Property, plant and equipment   529,000   560,000
Deferred tax assets   19,690,000   20,358,000
Total assets associated with discontinued operations   20,577,000   21,360,000
Accounts payable   234,000   368,000
Accrued liabilities   1,879,000   2,865,000
Total current liabilities associated with discontinued operations   2,113,000   3,233,000
Other long-term liabilities   344,000   447,000
Total liabilities associated with discontinued operations   2,457,000   3,680,000
Venezuela
        
Discontinued Operations        
Sale price of expropriated assets 441,700,000      
Installment payments, including an annual charge, received from sale of expropriated assets   17,800,000 34,300,000  
Prepayment of second quarter installment payment received     17,200,000  
Remaining expected proceeds from sale of expropriated assets   166,000,000    
Summary of operating results of the discontinued operations        
Expenses and selling, general and administrative   124,000 227,000  
Loss (recovery) attributable to expropriation and impairments   (16,421,000) (33,199,000)  
Other (income) loss, net   (2,386,000) (2,592,000)  
Income (loss) from discontinued operations, net of tax   18,683,000 35,564,000  
Summary of balance sheet data for discontinued operations        
Cash   69,000   74,000
Accounts receivable   5,000   1,000
Other current assets   8,000   16,000
Total current assets associated with discontinued operations   82,000   91,000
Total assets associated with discontinued operations   82,000   91,000
Accounts payable   234,000   366,000
Accrued liabilities   1,247,000   1,998,000
Total current liabilities associated with discontinued operations   1,481,000   2,364,000
Other long-term liabilities   344,000   447,000
Total liabilities associated with discontinued operations   1,825,000   2,811,000
Canada
        
Discontinued Operations        
Impairment charges     2,100,000  
Summary of operating results of the discontinued operations        
Revenue     10,828,000  
Expenses and selling, general and administrative     11,039,000  
Loss (recovery) attributable to expropriation and impairments     2,076,000  
Other (income) loss, net     34,000  
Provision for (benefit from) income taxes     (7,000)  
Income (loss) from discontinued operations, net of tax     (2,314,000)  
Contract Water Treatment Business
        
Summary of operating results of the discontinued operations        
Revenue     1,481,000  
Expenses and selling, general and administrative   73,000 1,048,000  
Other (income) loss, net   (147,000) (1,000)  
Provision for (benefit from) income taxes   30,000 168,000  
Income (loss) from discontinued operations, net of tax   44,000 266,000  
Summary of balance sheet data for discontinued operations        
Accounts receivable   212,000   287,000
Inventory   50,000   50,000
Other current assets   14,000   14,000
Total current assets associated with discontinued operations   276,000   351,000
Property, plant and equipment   529,000   560,000
Deferred tax assets   19,690,000   20,358,000
Total assets associated with discontinued operations   20,495,000   21,269,000
Accounts payable       2,000
Accrued liabilities   632,000   867,000
Total current liabilities associated with discontinued operations   632,000   869,000
Total liabilities associated with discontinued operations   $ 632,000   $ 869,000