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Dividends (Parenthetical) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Dividend Declared [Line Items] |  |  |
Dividends related to outstanding restricted stock units | $ 772 | $ 894 | $ 684
Effective Date of change in amount of quarterly dividend | Aug. 15, 2013 |  |
Revised quarterly dividend | $ 0.25 |  |

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- Details
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Data Type: | xbrli:stringItemType
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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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Balance Type: | na
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