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Earnings per share (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net income attributable to Consolidated Water Co. Ltd. common stockholders $ 1,957,492 $ 1,929,662 $ 4,300,158 $ 3,922,672
Less: Preferred stock dividends (2,421) (1,921) (4,842) (3,851)
Net income available to common shares in the determination of basic earnings per common share $ 1,955,071 $ 1,927,741 $ 4,295,316 $ 3,918,821
Weighted average number of common shares in the determination of basic earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders 14,579,496 14,558,937 14,574,689 14,557,606
Weighted average number of preferred shares outstanding during the period 24,082 17,725 23,187 17,174
Potential dilutive effect of unexercised stock options 274 18,423 178 22,263
Weighted average number of shares used for determining diluted earnings per common share attributable to Consolidated Water Co. Ltd. common stockholders 14,603,852 14,595,085 14,598,054 14,597,043