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Share Capital - Narrative (Details ) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 08, 2021 shares | Oct. 07, 2021 shares | Aug. 04, 2021 USD ($) shares | Aug. 02, 2021 shares | Feb. 28, 2022 shares | Dec. 31, 2021 USD ($) vote tradingDay $ / shares shares | Dec. 31, 2020 USD ($) $ / shares | Sep. 23, 2021 shares
Share Capital [Line Items] |  |  |  |  |  |  |  |
Preferred stock premium percentage |  |  |  |  |  | 125.00% |  |
Preferred stock conversion price (in dollars per share) | $ / shares |  |  |  |  |  | $ 5.00 |  |
Consecutive trading days | tradingDay |  |  |  |  |  | 30 |  |
Common stock reserved for future issuance (in shares) |  |  |  |  |  | 2,838,628 |  |
Excess tax benefit from stock-based compensation | $ |  |  |  |  |  | $ 5,289 |  |
Performance-Based Awards |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Weighted average remaining contractual life |  |  |  |  |  | 2 years 4 months 13 days |  |
Grant date fair value of options granted (in dollars per share) | $ / shares |  |  |  |  |  | $ 8.68 | $ 0 |
Award vesting period |  |  |  |  |  | 3 years |  |
Unrecognized compensation expense of awards | $ |  |  |  |  |  | $ 8,221 |  |
Unrecognized compensation expense period for recognition |  |  |  |  |  | 2 years 4 months 13 days |  |
Restricted Stock And Restricted Stock Units |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Fair value of vested awards | $ |  |  |  |  |  | $ 1,527 |  |
Time-Based Awards |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Weighted average remaining contractual life |  |  |  |  |  | 4 months 13 days |  |
Grant date fair value of options granted (in dollars per share) | $ / shares |  |  |  |  |  | $ 5.49 | $ 0 |
Award vesting period |  |  |  |  |  | 3 years |  |
Expiration period |  |  |  |  |  | 3 years |  |
Unrecognized compensation expense of awards | $ |  |  |  |  |  |  | $ 15,376 |
Unrecognized compensation expense period for recognition |  |  |  |  |  |  | 4 months 13 days |
SARs |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Weighted average remaining contractual life |  |  |  |  |  | 1 year 1 month 24 days |  |
Grant date fair value of options granted (in dollars per share) | $ / shares |  |  |  |  |  | $ 2.79 | $ 0 |
Risk free interest rate |  |  |  |  |  | 1.00% |  |
Dividend yield |  |  |  |  |  | 0.00% |  |
Expiration period |  |  |  |  |  | 5 years |  |
Shares vested and exercisable |  |  |  |  |  | 1,950,000 |  |
Aggregate intrinsic value of awards outstanding | $ |  |  |  |  |  | $ 19,677 |  |
Unrecognized compensation expense of awards | $ |  |  |  |  |  | $ 4,639 |  |
Unrecognized compensation expense period for recognition |  |  |  |  |  | 1 year 1 month 24 days |  |
SARs | Minimum |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Grant date fair value of options granted (in dollars per share) | $ / shares |  |  |  |  |  | $ 2.20 |  |
Expected life |  |  |  |  |  | 2 years 9 months 18 days |  |
Expected volatility rate |  |  |  |  |  | 35.50% |  |
Award vesting period |  |  |  |  |  | 1 year |  |
SARs | Maximum |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Grant date fair value of options granted (in dollars per share) | $ / shares |  |  |  |  |  | $ 3.66 |  |
Expected life |  |  |  |  |  | 4 years |  |
Expected volatility rate |  |  |  |  |  | 38.10% |  |
Award vesting period |  |  |  |  |  | 3 years |  |
Other Awards |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation expense of awards | $ |  |  |  |  |  | $ 36,418 |  |
Common Class A |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Common stock shares authorized |  |  |  |  |  | 1,000,000,000 |  |
Common stock shares issued |  |  |  |  |  | 118,247,820 |  |
Common stock shares outstanding |  |  |  |  |  | 118,247,820 |  |
Common stock, voting rights, number of votes per share | vote |  |  |  |  |  | 1 |  |
Common stock, par value per share (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.001 |  |
Number of shares issued upon conversion | 20,948,746 | 12,086,700 |  |  |  |  |  |
Common Class A | Subsequent Event [Member] |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Number of shares issued upon conversion |  |  |  |  | 15,155,141 |  |  |
Common Class B |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Common stock shares authorized |  |  |  |  |  | 5,000 |  |
Common stock shares issued |  |  |  |  |  | 3,946 |  |
Common stock shares outstanding |  |  |  |  |  | 3,946 |  |
Common stock, voting rights, number of votes per share | vote |  |  |  |  |  | 20 |  |
Common stock, par value per share (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.00 |  |
Common Class C |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Common stock shares authorized |  |  |  |  |  | 250,000,000 |  |
Common stock shares issued |  |  |  |  |  | 179,970,051.000 |  |
Common stock shares outstanding |  |  |  |  |  | 179,970,051.000 |  |
Series 6 Convertible Preferred Stock |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Preferred stock, par value per share (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.001 |  |
Series 6 Convertible Preferred Stock | Stagwell Agency Holdings LLC |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Preference shares, outstanding (in shares) |  |  |  |  |  | 50,000,000 |  | 50,000,000
Preferred stock shares issued (in shares) |  |  |  |  |  |  |  | 50,000,000
Series 8 Preferred Stock |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Preferred stock, par value per share (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.001 |  |
Preferred stock liquidation value | $ |  |  | $ 30,000 |  |  |  |  |
Stock redeemed during period | $ |  |  | $ 25,000 |  |  |  |  |
Shares redeemed during period |  |  | 21,151,000 |  |  |  |  |
Series 8 Preferred Stock | The Goldman Sachs Group, Inc. |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Preference shares, outstanding (in shares) |  |  |  |  |  | 73,849,000 |  |
MDC | Common Class C | Stagwell Media |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Stock issued in acquisitions (in shares) |  |  |  | 179,970,051 |  |  |  |

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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=120381028&loc=d3e5070-113901 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 + 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 The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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