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Stockholders' Equity and Share-Based Awards - Additional Information (Detail) shares in Millions, $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($) shares
Performance Based Restricted Stock Units Rsu [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of stock units awarded | shares | 1.0
Share-based compensation arrangement by share-based payment award, award vesting period | 3 years
Aggregate grant date fair value | $ | $ 33.7
Time-Based RSU's [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of stock units awarded | shares | 1.4
Share-based compensation arrangement by share-based payment award, award vesting period | 3 years
Aggregate grant date fair value | $ | $ 38.0
Share-based awards vesting terms | Vesting in equal installments over a three-year period.

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- Definition Share-based compensation arrangement by share-based payment award aggregate grant date fair value. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -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 Net number of non-option equity instruments granted to participants. + 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)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements. + 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 (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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