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Compensation - Activity Associated with Restricted Stock Units (Detail) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of Units, Balance outstanding at beginning of period | 4,478,000 | 929,000 | 1,063,000 |
Number of Units, Granted | 6,618,000 | 4,283,000 | 578,000 |
Number of Units, Delivered | (1,579,000) | (464,000) | (553,000) |
Number of Units, Forfeited | (557,000) | (270,000) | (159,000) |
Number of Units, Balance outstanding at end of period | 8,960,000 | 4,478,000 | 929,000 | 1,063,000
Weighted-Average Grant Date Fair Value, Balance outstanding at beginning of period | $ 5.25 | $ 10.83 | $ 9.08 |
Weighted-Average Grant Date Fair Value, Granted | 3.25 | 4.61 | 12.05 |
Weighted-Average Grant Date Fair Value, Delivered | 5.79 | 10.11 | 8.59 |
Weighted-Average Grant Date Fair Value, Forfeited | 4.11 | 5.99 | 11.34 |
Weighted-Average Grant Date Fair Value, Balance outstanding at end of period | $ 3.75 | $ 5.25 | $ 10.83 | $ 9.08
Fair Value, Balance outstanding at beginning of period | $ 23,516 | $ 10,058 | $ 9,651 |
Fair Value, Granted | 21,506 | 19,764 | 6,964 |
Fair Value, Delivered | (9,148) | (4,692) | (4,753) |
Fair Value, Forfeited | (2,292) | (1,614) | (1,804) |
Fair Value, Balance outstanding at end of period | $ 33,582 | $ 23,516 | $ 10,058 | $ 9,651
Weighted-Average Remaining Contractual Term (Years) | 1 year 11 months 19 days | 2 years 6 months | 1 year 9 months | 1 year 7 months 17 days

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options forfeitures in period fair value. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options granted in period fair value. + References No definition available. + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, 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=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the 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 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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