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Stock-Based Compensation Expense - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Jul. 06, 2015 USD ($) shares | Dec. 31, 2015 USD ($) Employees $ / shares shares | Dec. 31, 2014 USD ($) $ / shares | Dec. 31, 2013 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of groups within the employee population | Employees |  | 2 |  |
Percentage of stock options granted to all other employees expected to vest |  | 73.00% |  |
Percentage of stock options granted to senior management expected to vest |  | 74.00% |  |
Estimated forfeiture rate for unvested options for senior management |  | 10.00% |  |
Estimated forfeiture rate for unvested options for all non-senior management |  | 11.00% |  |
Increase In Compensation Expense Due To Revised Estimated Forfeiture Rates |  | $ 461,000 | $ 288,000 | $ 300,000
Weighted-average grant-date fair values of stock options granted | $ / shares |  | $ 14.35 | $ 15.97 | $ 8.21
Total intrinsic values of stock options exercised |  | $ 43,987,000 | $ 31,884,000 | $ 32,096,000
Total fair values of stock options vested |  | 16,227,000 | 11,627,000 | 9,717,000
Total unrecognized compensation expense related to non-vested stock options |  | $ 18,785,000 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Period for Recognition |  | 1 year 6 months 15 days |  |
Stock-based compensation expense |  | $ 21,274,000 | 15,158,000 | 10,620,000
Income tax benefit recognized related to stock-based compensation expense |  | 7,127,000 | 4,977,000 | 3,482,000
Compensation expense capitalized |  | $ 0 | $ 0 | $ 0
Employee Stock Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for grant under stock option plans | shares |  | 9,844,051 |  |
Vesting period for stock option plans |  | 4 years |  |
Expiration period of stock option plan |  | 10 years |  |
Expected dividend yield, beginning in 2015 |  | 1.25% |  |
Discontinued Operations, Disposed of by Sale [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 1,106,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number | shares | 190,000 |  |  |

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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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: 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 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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