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Stock-Based Compensation Expense - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 USD ($) Employees $ / shares shares | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of groups within the employee population | Employees | 2 |  |
Estimated forfeiture rate for unvested options for senior management | 8.00% |  |
Estimated forfeiture rate for unvested options for all non-senior management | 12.00% |  |
Increase in compensation expense due to revised estimated forfeiture rates | $ 1,283,000 | $ 673,000 | $ 334,000
Weighted-average grant-date fair values of stock options granted | $ / shares | $ 20.84 | $ 15.59 | $ 6.33
Total intrinsic values of stock options exercised | $ 52,629,000 | $ 136,672,000 | $ 55,580,000
Total fair values of stock options vested | 31,106,000 | 21,519,000 | 18,114,000
Total unrecognized compensation expense related to non-vested stock options | $ 49,229,000 |  |
Recognition period for unrecognized compensation expense | 1 year 6 months 21 days |  |
Stock-based compensation expense | $ 41,090,000 | 31,942,000 | 20,558,000
Income tax benefit recognized related to stock-based compensation expense | 7,317,000 | 10,473,000 | 6,747,000
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 | 19,578,752 |  |
Vesting period for stock option plans | 4 years |  |
Expiration period of stock option plan | 10 years |  |
Minimum [Member] | Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period for stock option plans | 4 years |  |
Minimum [Member] | Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period for stock option plans | 1 year |  |
Maximum [Member] | Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period for stock option plans | 5 years |  |
Maximum [Member] | Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period for stock option plans | 3 years |  |

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- Definition Estimated forfeiture rate for unvested options for all non-senior management. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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