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Subsequent Events (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 02, 2021 | Nov. 01, 2021 | Nov. 05, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Oct. 07, 2021 | Jun. 22, 2016 | Jun. 21, 2016
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends declared per share of common stock (in dollars per share) |  |  |  | $ 0.01 | $ 0.01 | $ 0.03 | $ 0.16 |  |  |
Aggregate purchase price of Class A common stock |  |  |  |  |  | $ 227,052 | $ 6 |  |  |
Subsequent Event | Senior Revolving Credit Agreement | Unsecured Credit Agreement |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  | $ 300,000 |  |  |  |  |  |  |  |
Subsequent Event | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Insurance |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses |  | 534,900 |  |  |  |  |  |  |  |
Advisor fee |  | $ 4,400 |  |  |  |  |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  | 24,400,000 | 2,000 | 41,900,000 | 2,000 |  |  |
Aggregate purchase price of Class A common stock |  |  |  | $ 126,800 | $ 6 | $ 234,600 | $ 6 |  |  |
Stock repurchased, weighted average price (in dollars per share) |  |  |  | $ 5.19 | $ 2.58 | $ 5.59 | $ 2.58 |  |  |
Class A Common Stock | Long Term Equity Incentive Plan |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Long term incentive plan, shares authorized (in shares) |  |  |  |  |  |  |  |  | 400,000,000 | 350,000,000
Class A Common Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  | 13,900,000 |  |  |  |  |  |  |
Aggregate purchase price of Class A common stock |  |  | $ 71,800 |  |  |  |  |  |  |
Stock repurchased, weighted average price (in dollars per share) |  |  | $ 5.15 |  |  |  |  |  |  |
Class A Common Stock | Subsequent Event | Long Term Equity Incentive Plan |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Long term incentive plan, increase in number of shares authorized (in shares) |  |  |  |  |  |  |  | 100,000,000 |  |
Long term incentive plan, shares authorized (in shares) |  |  |  |  |  |  |  | 500,000,000 |  |
Long term incentive plan, per-participant limit (in shares) |  |  |  |  |  |  |  | 15,000,000 |  |
Class B Common Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends declared per share of common stock (in dollars per share) | $ 0.01 |  |  |  |  |  |  |  |  |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Increase In Number of Shares Authorized + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant, Per-participant Limit + References No definition available. + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: 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(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 4: 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 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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