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Stock-Based Compensation - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 Employees | Dec. 31, 2012 | Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for grant under stock option plans | 11,165,480 |  |
Expected dividend yield | 0.00% | 1.20% | 1.10%
Weighted-average grant-date fair values of stock options granted | $ 8.21 | $ 6.58 | $ 6.16
Number of groups within the employee population | 2 |  |
Percentage of stock options granted to senior management expected to vest | 71.00% |  |
Percentage of stock options granted to all other employees expected to vest | 69.00% |  |
Estimated forfeiture rate for unvested options for senior management | 12.00% |  |
Estimated forfeiture rate for unvested options for all non-senior management | 13.00% |  |
Increase in compensation expense due to revised estimated forfeiture rates | $ 300,000 | $ 200,000 |
Reduction in compensation expense due to revised estimated forfeiture rates |  |  | 80,000
Stock-based compensation expense | 10,620,000 | 8,520,000 | 8,068,000
Income tax benefit recognized related to stock-based compensation expense | 3,482,000 | 2,772,000 | 2,660,000
Compensation expense was capitalized | 0 | 0 | 0
Total intrinsic values of stock options exercised | 32,096,000 | 16,296,000 | 20,108,000
Total fair values of stock options vested | 9,717,000 | 9,362,000 | 10,202,000
Total unrecognized compensation expense related to non-vested stock options | $ 8,464,000 |  |
Weighted-average period for unrecognized compensation expense related to non-vested stock options (years) | 1 year 2 months 5 days |  |
Stock Option and Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period of stock option plan | 10 years |  |
Vesting period for stock option plans | 4 years |  |
2015 Through Expected Life of Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expected dividend yield | 1.04% |  |

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