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Share-Based Compensation and Cash-Based Incentive Compensation (Schedule of Compensation Expense Under Share-Based Payment Arrangements and Related Tax Benefit) (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Share-based compensation | $ 3,159 | $ 1,835 | $ 5,818 | $ 3,662 |
| Tax benefit computed at the statutory rate | 1,106 | 642 | 2,036 | 1,282 |
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Restricted Stock
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Share-based compensation | 108 | 603 | 214 | 1,191 |
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Restricted Stock Units (RSUs)
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Share-based compensation | $ 3,051 | $ 1,232 | $ 5,604 | $ 2,471 |