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Discontinued Operations (Details) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2012
Jun. 30, 2014
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Summary of operating results of the discontinued operations              
Revenue     $ 15,068,000     $ 27,377,000  
Expenses and selling, general and administrative   225,000 11,612,000   422,000 23,926,000  
Loss (recovery) attributable to expropriation and impairments   (16,563,000) 3,696,000   (32,984,000) (27,427,000)  
Other (income) loss, net   (1,352,000) 462,000   (3,885,000) (2,097,000)  
Provision for (benefit from) income taxes   (79,000) 404,000   (49,000) 565,000  
Income (loss) from discontinued operations, net of tax   17,769,000 (1,106,000)   36,496,000 32,410,000  
Summary of balance sheet data for discontinued operations              
Cash   70,000     70,000   74,000
Accounts receivable   167,000     167,000   288,000
Inventory   36,000     36,000   50,000
Other current assets   20,000     20,000   30,000
Total current assets associated with discontinued operations   293,000     293,000   442,000
Property, plant and equipment, net   319,000     319,000   560,000
Deferred tax assets   19,376,000     19,376,000   20,358,000
Total assets associated with discontinued operations   19,988,000     19,988,000   21,360,000
Accounts payable   236,000     236,000   368,000
Accrued liabilities   1,979,000     1,979,000   2,865,000
Total current liabilities associated with discontinued operations   2,215,000     2,215,000   3,233,000
Other long-term liabilities   307,000     307,000   447,000
Total liabilities associated with discontinued operations   2,522,000     2,522,000   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   18,100,000   34,300,000 35,900,000    
Prepayment of second quarter installment payment received       17,200,000      
Remaining expected proceeds from sale of expropriated assets   149,000,000     149,000,000    
Summary of operating results of the discontinued operations              
Expenses and selling, general and administrative   121,000 81,000   245,000 308,000  
Loss (recovery) attributable to expropriation and impairments   (16,563,000) (228,000)   (32,984,000) (33,427,000)  
Other (income) loss, net   (1,472,000)     (3,858,000) (2,592,000)  
Income (loss) from discontinued operations, net of tax   17,914,000 147,000   36,597,000 35,711,000  
Summary of balance sheet data for discontinued operations              
Cash   70,000     70,000   74,000
Accounts receivable   1,000     1,000   1,000
Other current assets   6,000     6,000   16,000
Total current assets associated with discontinued operations   77,000     77,000   91,000
Total assets associated with discontinued operations   77,000     77,000   91,000
Accounts payable   236,000     236,000   366,000
Accrued liabilities   1,271,000     1,271,000   1,998,000
Total current liabilities associated with discontinued operations   1,507,000     1,507,000   2,364,000
Other long-term liabilities   307,000     307,000   447,000
Total liabilities associated with discontinued operations   1,814,000     1,814,000   2,811,000
Canada
              
Discontinued Operations              
Impairment charges     3,900,000     6,000,000  
Summary of operating results of the discontinued operations              
Revenue     13,630,000     24,458,000  
Expenses and selling, general and administrative     10,771,000     21,810,000  
Loss (recovery) attributable to expropriation and impairments     3,924,000     6,000,000  
Other (income) loss, net     478,000     512,000  
Provision for (benefit from) income taxes     179,000     172,000  
Income (loss) from discontinued operations, net of tax     (1,722,000)     (4,036,000)  
Contract Water Treatment Business
              
Summary of operating results of the discontinued operations              
Revenue     1,438,000     2,919,000  
Expenses and selling, general and administrative   104,000 760,000   177,000 1,808,000  
Other (income) loss, net   120,000 (16,000)   (27,000) (17,000)  
Provision for (benefit from) income taxes   (79,000) 225,000   (49,000) 393,000  
Income (loss) from discontinued operations, net of tax   (145,000) 469,000   (101,000) 735,000  
Summary of balance sheet data for discontinued operations              
Accounts receivable   166,000     166,000   287,000
Inventory   36,000     36,000   50,000
Other current assets   14,000     14,000   14,000
Total current assets associated with discontinued operations   216,000     216,000   351,000
Property, plant and equipment, net   319,000     319,000   560,000
Deferred tax assets   19,376,000     19,376,000   20,358,000
Total assets associated with discontinued operations   19,911,000     19,911,000   21,269,000
Accounts payable             2,000
Accrued liabilities   708,000     708,000   867,000
Total current liabilities associated with discontinued operations   708,000     708,000   869,000
Total liabilities associated with discontinued operations   $ 708,000     $ 708,000   $ 869,000