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Earnings per share (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Line Items]        
Net income attributable to Consolidated Water Co. Ltd. common stockholders $ 1,775,500 $ 1,882,692 $ 5,924,861 $ 5,297,294
Less: preferred stock dividends (2,937) (2,777) (9,118) (8,722)
Net income available to common shares in the determination of basic earnings per common share $ 1,772,563 $ 1,879,915 $ 5,915,743 $ 5,288,572
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders (in shares) 14,749,249 14,700,939 14,734,799 14,695,446
Weighted average number of preferred shares outstanding during the period (in shares) 40,194 39,348 38,510 38,256
Potential dilutive effect of unexercised options (in shares) 12,879 23,627 14,595 30,425
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders (in shares) 14,802,322 14,763,914 14,787,904 14,764,127