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Income Taxes - Income Tax Benefits in Shareholders' Equity (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Taxes [Line Items] |  |  |
Income tax benefits arising from compensation expense for tax purposes in excess of amounts recognized for financial statement purposes | $ 14,319 | $ 22,835 | $ 63,558

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- Definition The aggregate cash inflow comprised of the amount received from (a) employees to acquire the entity's shares under incentive awards, including stock option exercises and restricted stock arrangements, and (b) the excess tax benefit arising from such transactions. + References No definition available. + Details
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