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Stockholders' Equity and Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
May 01, 2017 | Apr. 26, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Compensation expense related to ESPP |  |  | $ 38,513 | $ 22,546 | $ 3,010
Software and Capitalized Software Costs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Capitalized compensation cost |  |  | 3,300 | 1,800 | $ 200
Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Compensation expense related to ESPP |  |  | 38,500 | $ 22,500 |
Total unrecognized compensation cost related to unvested restricted stock |  |  | $ 30,300 |  |
Unrecognized compensation expected to be recognized |  |  | 2 years 1 month 6 days |  |
Restricted Stock [Member] | LTIP [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Restricted shares of common stock issued | 9,870 | 613,677 |  |  |
Restricted Stock [Member] | Vest 50% if Company's total enterprise value equals or exceeds $4.15 billion [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Market-based vesting percentage, restricted shares |  | 50.00% |  |  |
Total enterprise value |  | $ 4,150,000 |  |  |
Restricted Stock [Member] | Vest 50% if Company's total enterprise value equals or exceeds $4.45 billion [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Market-based vesting percentage, restricted shares |  | 50.00% |  |  |
Total enterprise value |  | $ 4,450,000 |  |  |
Restricted Stock [Member] | Market-based Vesting Conditions [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Restricted common stock, expiration period |  | 6 years |  |  |
Restricted Stock [Member] | Time-based Vesting Conditions [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Share-based compensation award vesting period |  | 2 years |  |  |
Restricted Stock [Member] | Time-based Vesting Conditions [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Share-based compensation award vesting period |  | 5 years |  |  |

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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=96867065&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=96867065&loc=d3e5070-113901 + Details
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