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Earnings Per Share - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Diluted earnings per share, excluded shares having anti-dilutive effect | 17,492 | 33,511 | 129,641
Class B Common Stock |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Convertible Class B common stock outstanding | 2,706,338 | 2,846,334 | 2,858,592

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