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Dividends (Parenthetical) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2012 Restricted Stock Units (RSUs) | Dec. 31, 2011 Restricted Stock Units (RSUs) | Dec. 31, 2010 Restricted Stock Units (RSUs)
Dividend Declared [Line Items] |  |  |  |
Dividends related to outstanding restricted stock units |  | $ 894 | $ 684 | $ 635
Effective Date of change in amount of quarterly dividend | Nov. 02, 2010 |  |  |
Revised quarterly dividend | $ 0.21 |  |  |

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- Details
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- Definition Amount of dividends accrued on unvested restricted stock units to be paid upon vesting. + References No definition available. + Details
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- Definition The date on which the company's board of directors raised its quarterly dividend. + References No definition available. + Details
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- Definition Amount of revised quarterly dividend per common share. + References No definition available. + Details
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