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Segment information (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Revenues $ 16,555,197 $ 16,728,727  
Cost of revenues 10,334,690 10,780,878  
Gross profit 6,220,507 5,947,849  
General and administrative expenses 3,568,936 3,514,685  
Income (loss) from operations 2,651,571 2,433,164  
Other income (expense), net 1,212,116 (132)  
Consolidated net income 3,863,687 2,433,032  
Income attributable to non-controlling interests 121,684 90,366  
Net income attributable to Consolidated Water Co. Ltd. stockholders 3,742,003 2,342,666  
Property plant of equipment, net 58,429,492   58,993,406
Construction in progress 3,199,525   2,612,800
Goodwill 3,499,037   3,499,037
Total assets 153,150,993   150,449,086
Retail [Member]
      
Revenues 6,395,012 6,566,129  
Cost of revenues 2,834,752 3,042,747  
Gross profit 3,560,260 3,523,382  
General and administrative expenses 2,631,510 2,796,168  
Income (loss) from operations 928,750 727,214  
Property plant of equipment, net 23,856,857   24,021,301
Construction in progress 2,953,076   2,342,248
Goodwill 1,170,511   1,170,511
Total assets 64,711,831   63,649,696
Bulk [Member]
      
Revenues 9,856,690 10,069,217  
Cost of revenues 7,187,413 7,655,453  
Gross profit 2,669,277 2,413,764  
General and administrative expenses 408,247 327,400  
Income (loss) from operations 2,261,030 2,086,364  
Property plant of equipment, net 33,943,497   34,308,805
Construction in progress 229,575   270,552
Goodwill 2,328,526   2,328,526
Total assets 84,630,158   83,177,550
Services [Member]
      
Revenues 303,495 93,381  
Cost of revenues 312,525 82,678  
Gross profit (9,030) 10,703  
General and administrative expenses 529,179 391,117  
Income (loss) from operations (538,209) (380,414)  
Property plant of equipment, net 629,138   663,300
Construction in progress 16,874   0
Goodwill 0   0
Total assets $ 3,809,004   $ 3,621,840