Share-Based Employee Compensation - Additional Information (Details)
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3 Months Ended |
12 Months Ended |
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Jul. 17, 2019
shares
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Mar. 31, 2019
shares
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Dec. 31, 2021
USD ($)
Tranche
Installment
$ / shares
shares
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Dec. 31, 2020
USD ($)
$ / shares
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Dec. 31, 2019
USD ($)
shares
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Dec. 31, 2018
USD ($)
shares
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Dec. 31, 2017
shares
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| Restricted Stock |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Vesting percentage |
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50.00%
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| Vesting description |
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50% of the RSAs scheduled to vest in three (3) equal installments on the third, fourth and fifth anniversaries of November 18, 2016, subject to the recipient’s continued employment through the vesting date, and 50% subject to the recipient’s continued employment through February 1, 2021 and the satisfaction of a performance-based vesting condition.
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| Share-based compensation expense |
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$ 41,715,000
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$ 48,045,000
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$ 23,198,000
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| Exchange of shares with stockholders on liquidation | shares |
6,309,049
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6,309,049
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| Number of equal vesting installments | Installment |
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3
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| Vesting upon satisfaction of condition |
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50.00%
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| Stock Option |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Unrecognized compensation cost |
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$ 829,000
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| Expected to be recognized period |
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6 months
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| Restricted Stock Units |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Share-based compensation expense |
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$ 6,104,000
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2,148,000
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$ 530,000
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| Unrecognized compensation cost |
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$ 21,915,000
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| Expected to be recognized period |
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3 years 1 month 6 days
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| Fair value of RSUs vested |
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$ 2,760,000
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| Stock Appreciation Rights (SARs) |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Share-based compensation expense |
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3,432,000
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$ 1,298,000
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| Unrecognized compensation cost |
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$ 12,219,000
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| Number of shares, granted | shares |
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894,411
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831,902
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| Exercise price | $ / shares |
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$ 25.59
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$ 28.42
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| Expected to be recognized period |
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3 years
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| 2019 Equity Incentive Plan |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Share available for issuance under the plan | shares |
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2,006,495
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| 2019 Equity Incentive Plan | Stock Option |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Vesting description |
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Each of these options is scheduled to vest and become exercisable in substantially equal installments on each of the first three anniversaries of July 18, 2019, subject to the recipient’s continued employment through the vesting date and have a ten-year contractual term.
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| Number of shares, granted | shares |
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918,981
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| Exercise price | $ / shares |
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$ 22
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| Contractual term |
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10 years
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| 2019 Equity Incentive Plan | Stock Appreciation Rights (SARs) |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Vesting description |
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Each SAR has a strike price equal to the fair market value of the Company’s common stock on the date of grant and is scheduled to vest and become exercisable in substantially equal installments on each of the first four anniversaries of their grant date, subject to the recipient’s continued employment through the vesting date, and have a ten-year contractual term.
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| Contractual term |
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10 years
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| Class C Common Units |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Number of shares authorized | shares |
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151,188
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| Possible expiration period |
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8 years
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| Vested units | shares |
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0
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| Unrecognized compensation cost |
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$ 0
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$ 29,051,000
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| Number of shares, granted | shares |
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120.02
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| Class C Common Units | AssetMark Holdings LLC |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Number of tranches | Tranche |
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2
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| Vesting description |
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5-year requisite service period for 50% of the units and over an 8-year requisite service period for the remaining 50% of the units.
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| Share-based compensation expense |
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$ 11,407,000
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$ 6,568,000
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| Class C Common Units | Time Vesting Units | AssetMark Holdings LLC |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Vesting units requisite service period |
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5 years
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| Vesting percentage |
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50.00%
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| Class C Common Units | Performance Vesting Units | AssetMark Holdings LLC |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Vesting units requisite service period |
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8 years
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| Vesting percentage |
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50.00%
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