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Segment information (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Revenues $ 15,840,136 $ 12,806,652 $ 48,799,642 $ 41,549,144  
Cost of revenues 10,605,142 8,797,802 32,205,099 27,038,533  
Gross profit 5,234,994 4,008,850 16,594,543 14,510,611  
General and administrative expenses 4,089,575 3,031,951 11,052,833 10,005,245  
Income (loss) from operations 1,145,419 976,899 5,541,710 4,505,366  
Other income (expense), net 221,655 324,749 339,023 1,066,431  
Consolidated net income 1,367,074 1,301,648 5,880,733 5,571,797  
Income attributable to non-controlling interests 62,231 15,580 275,732 363,057  
Net income attributable to Consolidated Water Co. Ltd. Stockholders 1,304,843 1,286,068 5,605,001 5,208,740  
Property plant and equipment, net 60,705,031 52,378,833 60,705,031 52,378,833 64,185,110
Construction in progress 1,164,081 9,743,726 1,164,081 9,743,726 141,204
Goodwill 3,587,754 3,587,754 3,587,754 3,587,754 3,587,754
Total assets 148,094,077 155,588,975 148,094,077 155,588,975 160,859,431
Retail [Member]
          
Revenues 5,703,233 5,283,676 18,138,615 18,212,067  
Cost of revenues 2,798,560 2,865,554 8,720,675 8,819,155  
Gross profit 2,904,673 2,418,122 9,417,940 9,392,912  
General and administrative expenses 3,241,323 2,324,785 8,730,075 6,890,482  
Income (loss) from operations (336,650) 93,337 687,865 2,502,430  
Property plant and equipment, net 24,443,943 25,811,059 24,443,943 25,811,059  
Construction in progress 868,202 154,242 868,202 154,242  
Goodwill 1,170,511 1,170,511 1,170,511 1,170,511  
Total assets 60,820,634 69,091,372 60,820,634 69,091,372  
Bulk [Member]
          
Revenues 10,031,176 7,452,759 30,313,063 22,394,239  
Cost of revenues 7,777,247 5,807,061 23,301,186 17,739,995  
Gross profit 2,253,929 1,645,698 7,011,877 4,654,244  
General and administrative expenses 316,240 375,630 953,004 965,159  
Income (loss) from operations 1,937,689 1,270,068 6,058,873 3,689,085  
Property plant and equipment, net 35,537,488 25,602,854 35,537,488 25,602,854  
Construction in progress 295,879 9,589,484 295,879 9,589,484  
Goodwill 2,328,526 2,328,526 2,328,526 2,328,526  
Total assets 83,601,963 81,605,190 83,601,963 81,605,190  
Services [Member]
          
Revenues 105,727 70,217 347,964 942,838  
Cost of revenues 29,335 125,187 183,238 479,383  
Gross profit 76,392 (54,970) 164,726 463,455  
General and administrative expenses 532,012 331,536 1,369,754 2,149,604  
Income (loss) from operations (455,620) (386,506) (1,205,028) (1,686,149)  
Property plant and equipment, net 723,600 964,920 723,600 964,920  
Construction in progress 0 0 0 0  
Goodwill 88,717 88,717 88,717 88,717  
Total assets $ 3,671,480 $ 4,892,413 $ 3,671,480 $ 4,892,413