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Stock-Based Compensation - Additional Information (Detail) - USD ($) | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares granted, vesting period | 3 years | 5 years
Shares available for grant | 172,685 |
Shares granted | 2,387,645 |
Shares granted, weighted average grant date fair value | $ 11.64 |
Unrecognized compensation cost relating to unvested restricted stock | $ 82,200,000 |
Unrecognized compensation cost relating to unvested restricted stock, recognition period (in years) | 3 years 3 months 18 days |
Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Compensation and benefits expense | $ 7,800,000 | $ 7,900,000
Performance Based Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares granted | 418,674 |
Compensation and benefits expense | $ 407,000 |
Vesting rights, description | The PSUs have a performance period of January 1, 2019 to December 31, 2021 and vest on April 1, 2022, subject to adjustment or forfeiture, based upon the achievement by the Company of certain performance standards. |
Stock Incentive Plan Twenty Twelve | Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares granted | 2,387,645 | 1,723,240
Shares granted, weighted average grant date fair value | $ 11.64 | $ 10.32
Four Zero One K Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Employer Discretionary Contribution Amount | $ 1,600,000 |

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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=116856206&loc=d3e5070-113901 + Details
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