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Discontinued Operations (Details)
 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Dec. 31, 2013
USD ($)
Aug. 31, 2012
Venezuela
USD ($)
Sep. 30, 2014
Venezuela
USD ($)
Sep. 30, 2013
Venezuela
USD ($)
Sep. 30, 2014
Venezuela
USD ($)
Sep. 30, 2013
Venezuela
USD ($)
Dec. 31, 2013
Venezuela
USD ($)
Jul. 31, 2013
Canada
USD ($)
Sep. 30, 2013
Canada
USD ($)
Sep. 30, 2013
Canada
USD ($)
Jul. 31, 2013
Canada
CAD
Sep. 30, 2014
Contract Water Treatment Business
USD ($)
Sep. 30, 2013
Contract Water Treatment Business
USD ($)
Sep. 30, 2014
Contract Water Treatment Business
USD ($)
Sep. 30, 2013
Contract Water Treatment Business
USD ($)
Dec. 31, 2013
Contract Water Treatment Business
USD ($)
Discontinued Operations                                        
Sale price of expropriated assets           $ 441,700,000                            
Installment payments, including an annual charge, received from sale of expropriated assets             18,200,000 17,400,000 54,100,000 51,700,000                    
Remaining expected proceeds from sale of expropriated assets             133,000,000   133,000,000                      
Impairment charges                           6,000,000         2,400,000  
Cash proceeds                       12,300,000                
Note receivable                             8,100,000          
Contingent consideration                             5,000,000          
Potential tax refund                             1,600,000          
Summary of operating results of the discontinued operations                                        
Revenue   419,000   27,796,000                   24,458,000     419,000   3,338,000  
Expenses and selling, general and administrative 271,000 1,133,000 693,000 25,059,000     84,000 423,000 329,000 731,000       21,810,000   187,000 710,000 364,000 2,518,000  
Loss (recovery) attributable to expropriation and impairments (16,220,000) (14,134,000) (49,204,000) (41,561,000)     (16,539,000) (16,489,000) (49,523,000) (49,916,000)       6,000,000   319,000 2,355,000 319,000 2,355,000  
Other (income) loss, net (1,880,000) (413,000) (5,765,000) (2,510,000)     (1,880,000) (847,000) (5,738,000) (3,439,000)     (598,000) (86,000)     1,032,000 (27,000) 1,015,000  
Provision for (benefit from) income taxes (174,000) (1,288,000) (223,000) (723,000)                   172,000   (174,000) (1,288,000) (223,000) (895,000)  
Income (loss) from discontinued operations, net of tax 18,003,000 15,121,000 54,499,000 47,531,000     18,335,000 16,913,000 54,932,000 52,624,000     598,000 (3,438,000)   (332,000) (2,390,000) (433,000) (1,655,000)  
Summary of balance sheet data for discontinued operations                                        
Cash 79,000   79,000   74,000   79,000   79,000   74,000                  
Accounts receivable 68,000   68,000   288,000           1,000         68,000   68,000   287,000
Inventory 36,000   36,000   50,000                     36,000   36,000   50,000
Other current assets 6,000   6,000   30,000   6,000   6,000   16,000                 14,000
Total current assets associated with discontinued operations 189,000   189,000   442,000   85,000   85,000   91,000         104,000   104,000   351,000
Property, plant and equipment, net         560,000                             560,000
Deferred tax assets 18,977,000   18,977,000   20,358,000                     18,977,000   18,977,000   20,358,000
Total assets associated with discontinued operations 19,166,000   19,166,000   21,360,000   85,000   85,000   91,000         19,081,000   19,081,000   21,269,000
Accounts payable 216,000   216,000   368,000   214,000   214,000   366,000         2,000   2,000   2,000
Accrued liabilities 1,821,000   1,821,000   2,865,000   1,130,000   1,130,000   1,998,000         691,000   691,000   867,000
Total current liabilities associated with discontinued operations 2,037,000   2,037,000   3,233,000   1,344,000   1,344,000   2,364,000         693,000   693,000   869,000
Other long-term liabilities 291,000   291,000   447,000   291,000   291,000   447,000                  
Total liabilities associated with discontinued operations $ 2,328,000   $ 2,328,000   $ 3,680,000   $ 1,635,000   $ 1,635,000   $ 2,811,000         $ 693,000   $ 693,000   $ 869,000