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Segment information (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Revenues $ 16,230,779 $ 14,835,872 $ 32,959,506 $ 28,742,492  
Cost of revenues 10,825,369 9,584,667 21,606,247 18,240,731  
Gross profit 5,405,410 5,251,205 11,353,259 10,501,761  
General and administrative expenses 3,442,283 3,180,879 6,956,968 6,973,294  
Income (loss) from operations 1,963,127 2,070,326 4,396,291 3,528,467  
Other income (expense), net 117,500 136,950 117,368 741,682  
Consolidated net income 2,080,627 2,207,276 4,513,659 4,270,149  
Income attributable to non-controlling interests 123,135 277,614 213,501 347,477  
Net income attributable to Consolidated Water Co. Ltd. stockholders 1,957,492 1,929,662 4,300,158 3,922,672  
Property, plant and equipment, net 62,046,304 53,382,795 62,046,304 53,382,795 64,185,110
Construction in progress 335,789 2,252,854 335,789 2,252,854 141,204
Goodwill 3,587,754 3,587,754 3,587,754 3,587,754 3,587,754
Total assets 146,223,204 153,798,352 146,223,204 153,798,352 160,859,431
Retail [Member]
          
Revenues 5,869,254 6,554,876 12,435,382 12,928,391  
Cost of revenues 2,885,657 3,072,727 5,928,405 5,953,601  
Gross profit 2,983,597 3,482,149 650,697 6,974,790  
General and administrative expenses 2,686,295 2,235,113 5,482,462 4,565,697  
Income (loss) from operations 297,302 1,247,036 1,024,515 2,409,093  
Property, plant and equipment, net 24,716,225 25,828,890 24,716,225 25,828,890  
Construction in progress 335,789 242,686 335,789 242,686  
Goodwill 1,170,511 1,170,511 1,170,511 1,170,511  
Total assets 62,060,701 73,981,242 62,060,701 73,981,242  
Bulk [Member]
          
Revenues 10,212,669 7,774,643 20,281,886 14,941,480  
Cost of revenues 7,868,487 6,330,567 15,523,939 11,932,934  
Gross profit 2,344,182 1,444,076 4,757,947 3,008,546  
General and administrative expenses 309,364 289,583 636,764 589,529  
Income (loss) from operations 2,034,818 1,154,493 4,121,183 2,419,017  
Property, plant and equipment, net 36,546,179 26,528,320 36,546,179 26,528,320  
Construction in progress 0 2,010,168 0 2,010,168  
Goodwill 2,328,526 2,328,526 2,328,526 2,328,526  
Total assets 80,958,499 75,008,585 80,958,499 75,008,585  
Services [Member]
          
Revenues 148,856 506,353 242,238 872,621  
Cost of revenues 71,225 181,373 153,903 354,196  
Gross profit 77,631 324,980 88,335 518,425  
General and administrative expenses 446,624 656,183 837,742 1,818,068  
Income (loss) from operations (368,993) (331,203) (749,407) (1,299,643)  
Property, plant and equipment, net 783,900 1,025,585 783,900 1,025,585  
Construction in progress 0 0 0 0  
Goodwill 88,717 88,717 88,717 88,717  
Total assets $ 3,204,004 $ 4,808,525 $ 3,204,004 $ 4,808,525