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Stock-Based Compensation Expense - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 OptionPlan Employees | Jul. 01, 2012 | Jun. 30, 2013 OptionPlan Employees | Jul. 01, 2012 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for grant under stock option plans | 5,614,591 |  | 5,614,591 |  |
Number of stock option plans | 2 |  | 2 |  |
Expected dividend yield | 0.00% | 1.20% | 0.00% | 1.20% |
Weighted-average grant-date fair values of stock options granted | $ 16.13 | $ 13.50 | $ 16.13 | $ 13.35 |
Number of groups within the employee population | 2 |  | 2 |  |
Percentage of stock options granted to senior management expected to vest | 71.00% |  | 71.00% |  |
Percentage of stock options granted to all other employees expected to vest | 69.00% |  | 69.00% |  |
Estimated forfeiture rate for unvested options for senior management | 12.00% |  | 12.00% |  |
Estimated forfeiture rate for unvested options for all non-senior management | 13.00% |  | 13.00% |  |
Stock-based compensation expense | $ 2,781,000 | $ 1,989,000 | $ 6,079,000 | $ 5,303,000 |
Income tax benefit recognized related to stock-based compensation expense | 911,000 | 646,000 | 2,004,000 | 1,733,000 |
Compensation expense was capitalized | 0 |  | 0 |  | 0
Total intrinsic values of stock options exercised | 6,759,000 | 672,000 | 13,952,000 | 13,308,000 |
Total fair values of stock options vest | 2,298,000 | 2,286,000 | 9,230,000 | 8,686,000 |
Total unrecognized compensation expense related to non-vested stock options | $ 12,233,000 |  | $ 12,233,000 |  |
Weighted-average period for unrecognized compensation expense related to non-vested stock options (years) |  |  | 1 year 7 months 6 days |  |
General Stock Option Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for grant under stock option plans | 4,355,481 |  | 4,355,481 |  |
Expiration period of stock option plan |  |  | 10 years |  |
Vesting period for stock option plans |  |  | 4 years |  |
Stock Option and Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for grant under stock option plans | 1,259,110 |  | 1,259,110 |  |
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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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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