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Share-Based Compensation - Additional Information (Detail) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 31, 2018 | Dec. 31, 2016 | May 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock options granted | 1,416,000 | 1,040,000 | 1,807,000 |  |  |
Stock options outstanding | 6,107,000 | 5,746,000 | 6,356,000 |  | 6,112,000 |
Number of common stock available for future grant | 6,800,000 |  |  |  |  |
Weighted-average fair values of stock options granted | $ 41.74 | $ 43.42 | $ 25.11 |  |  |
Weighted average remaining contractual term for stock options outstanding | 6 years 8 months 12 days |  |  |  |  |
Share-based compensation expense | $ 75,262,000 | $ 58,068,000 | $ 42,522,000 |  |  |
Number of stock options exercisable | 4,000,000.0 |  |  |  |  |
Stock options exercisable, weighted average exercise price | $ 41.01 |  |  |  |  |
Stock options exercisable, weighted-average remaining contractual term | 5 years 9 months 18 days |  |  |  |  |
Stock options exercised in period intrinsic value | $ 64,300,000 | 117,000,000.0 | 61,400,000 |  |  |
Stock options intrinsic value of options outstanding | 335,700,000 |  |  |  |  |
Stock options intrinsic value of options exercisable | 268,200,000 |  |  |  |  |
Cash received from stock option exercises | $ 27,300,000 | $ 29,500,000 | $ 13,900,000 |  |  |
Minimum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation, term | 3 years |  |  |  |  |
Maximum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation, term | 4 years |  |  |  |  |
Share-based compensation, contractual term | 10 years |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock units granted | 707,000 | 540,000 | 588,000 |  |  |
Share-based compensation expense | $ 30,400,000 | $ 21,900,000 | $ 13,900,000 |  |  |
Unrecognized compensation cost | $ 75,500,000 |  |  |  |  |
Stock vesting period | 2 years 4 months 24 days |  |  |  |  |
Total intrinsic value vested in period | $ 36,100,000 | $ 35,500,000 | $ 14,900,000 |  |  |
Intrinsic value outstanding | $ 147,200,000 |  |  |  |  |
Restricted stock units outstanding | 1,368,000 | 1,133,000 | 1,080,000 |  | 883,000 |
Restricted Stock Units (RSUs) | Minimum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock vesting period | 4 years |  |  |  |  |
Stock Options |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation, term | 10 years |  |  |  |  |
Share-based compensation expense | $ 36,500,000 | $ 35,400,000 | $ 28,200,000 |  |  |
Unrecognized compensation cost | $ 75,000,000.0 |  |  |  |  |
Stock vesting period | 2 years 4 months 24 days |  |  |  |  |
Stock Options | Minimum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock vesting period | 3 years |  |  |  |  |
Stock Options | Maximum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock vesting period | 4 years |  |  |  |  |
Performance-based RSUs |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock units granted | 0 | 200,000 | 0 |  |  |
Share-based compensation expense | $ 5,600,000 | $ 0 | $ 400,000 |  |  |
Unrecognized compensation cost | 14,100,000 |  |  |  |  |
Intrinsic value outstanding | $ 35,500,000 |  |  |  |  |
Restricted stock units outstanding | 300,000 | 300,000 |  |  |  |
Performance-based RSUs | Minimum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock vesting period | 4 years | 4 years |  |  |  |
Performance-based RSUs | Maximum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock vesting period | 5 years | 5 years |  |  |  |
Employees |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock options granted | 0 | 70,000 | 410,000 |  |  |
Stock vesting period |  | 4 years | 4 years |  |  |
Stock options outstanding | 211,000 |  |  |  |  |
Employees | Restricted Stock Units (RSUs) |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock units granted | 0 | 20,000 | 12,500 |  |  |
RSUs outstanding | 211,000 |  |  |  |  |
Employees | Restricted Stock Units (RSUs) | Minimum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock vesting period |  | 3 years | 3 years |  |  |
Employees | Restricted Stock Units (RSUs) | Maximum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock vesting period |  | 4 years | 4 years |  |  |
ESPP |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of common stock authorized for issuance |  |  |  | 300,000 |  |
Number of shares purchased |  | 0 |  |  |  |
Issuance of common stock for employee stock purchase plan | 78,000 |  |  |  |  |
Share-based compensation expense | $ 2,700,000 | $ 800,000 |  |  |  |
ESPP | Maximum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Discounted purchase price percentage of common stock authorized for issuance | 85.00% |  |  |  |  |
2011 Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of common stock authorized for issuance |  |  |  |  |  | 21,000,000
Share Based Compensation Arrangement Award |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of common stock authorized for issuance | 7,800,000 |  |  |  |  |
PRSUs Converted into Common Shares | Performance-based RSUs |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Intrinsic value outstanding |  |  | $ 8,800,000 |  |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of shares purchased for issuance under share-based payment arrangement. + 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=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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