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Share capital - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Preferred Stock [Member] | Dec. 31, 2012 Class A Stock [Member] | Dec. 31, 2011 Class A Stock [Member] | Dec. 31, 2010 Class A Stock [Member] | Oct. 07, 2011 Class A Stock [Member] | Dec. 31, 2009 Class A Stock [Member] | Dec. 31, 2012 Class B Stock [Member] | Dec. 31, 2011 Class B Stock [Member] | Dec. 31, 2010 Class B Stock [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |
Preferred stock par value |  |  |  |  |  |  |  |  |  |  | $ 0.001 |  |  |  |  |  |  |  |
Preferred stock issued |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  | 99,680 |  |
Common stock par value |  |  |  |  |  |  |  |  |  |  |  | $ 0.001 |  |  |  |  | $ 0.001 |  |
Common stock issued |  |  |  |  |  |  |  |  |  |  |  | 13,508,318 | 13,572,265 |  | 13,572,265 |  | 99,680 | 99,680 |
Common stock outstanding |  |  |  |  |  |  |  |  |  |  |  | 13,508,318 | 13,572,265 | 13,268,522 |  | 13,118,001 | 99,680 | 99,680 |
Repurchase of class A common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 675,000 |  |  |  |
Percentage of repurchase of class A common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |
Repurchase and cancelled stock |  |  |  |  |  |  |  |  |  |  |  | 121,599 |  |  |  |  |  |  |
Total Consideration of repurchase and cancelled stock |  |  |  |  |  |  |  |  |  |  |  | $ 1.9 |  |  |  |  |  |  |
Repurchase and cancelled stock per share |  |  |  |  |  |  |  |  |  |  |  | $ 15.35 |  |  |  |  |  |  |
Dividends per share | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.44 | $ 0.44 |  | $ 0.44 | $ 0.44 | $ 0.44 |  |  | $ 0.44 | $ 0.44 | $ 0.44

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