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Subsequent Events - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Dividends Payable [Line Items] |  |  |  |
Cash dividend payable amount per share | $ 0.11 | $ 0.11 | $ 0.33 | $ 0.33
Cash Dividend [Member] | Common Stock Class One And Two [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Cash dividend payable amount per share |  |  | $ 0.11 |
Cash dividend payable |  |  | $ 1,500 |
Date of payment of dividend |  |  | Nov. 23, 2012 |
Date of record of dividend |  |  | Nov. 09, 2012 |
Date of announcement of dividend |  |  | Oct. 25, 2012 |

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