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Stockholders' Equity and Stock-Based Compensation - Summary of Market-based Restricted Stock Vesting Activity (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Compensation Cost Recognized Upon Vesting (in millions) | $ 38,513 | $ 22,546 | $ 3,010
Market-based Restricted Stock [Member] | Market-based Vesting Conditions [Member] | Vest Date May 13, 2017 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Date Vested | May 13, 2017 |  |
Number of Shares Vested | 229,075 |  |
Compensation Cost Recognized Upon Vesting (in millions) | $ 2,900 |  |
Shares withheld to satisfy tax withholding obligations | 91,274 |  |
Market-based Restricted Stock [Member] | Market-based Vesting Conditions [Member] | Vest Date June 20, 2017 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Date Vested | Jun. 20, 2017 |  |
Number of Shares Vested | 248,250 |  |
Compensation Cost Recognized Upon Vesting (in millions) | $ 5,200 |  |
Shares withheld to satisfy tax withholding obligations | 103,907 |  |
Market-based Restricted Stock [Member] | Market-based Vesting Conditions [Member] | Vest Date August 25, 2017 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Date Vested | Aug. 25, 2017 |  |
Number of Shares Vested | 153,764 |  |
Compensation Cost Recognized Upon Vesting (in millions) | $ 5,500 |  |
Shares withheld to satisfy tax withholding obligations | 65,309 |  |
Market-based Restricted Stock [Member] | Market-based Vesting Conditions [Member] | Vest Date September 7, 2017 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Date Vested | Sep. 07, 2017 |  |
Number of Shares Vested | 244,850 |  |
Compensation Cost Recognized Upon Vesting (in millions) | $ 4,200 |  |
Shares withheld to satisfy tax withholding obligations | 102,548 |  |
Market-based Restricted Stock [Member] | Market-based Vesting Conditions [Member] | Vest Date October 13, 2017 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Date Vested | Oct. 13, 2017 |  |
Number of Shares Vested | 138,490 |  |
Compensation Cost Recognized Upon Vesting (in millions) | $ 4,300 |  |
Shares withheld to satisfy tax withholding obligations | 57,916 |  |

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- Definition Date the equity-based payment instruments, excluding stock (or unit) options vest, in CCYY-MM-DD format. + 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://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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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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