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Stock Transactions and Unit Redemptions - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 08, 2021 | Mar. 09, 2018 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Aug. 03, 2021 | Dec. 31, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program and unit redemption remaining authorized amount |  |  | $ 322,835 |  | $ 322,835 |  |  |
CF & Co |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, issued during the period (in shares) |  |  | 0 | 0 |  | 200,000 |  |
Aggregate proceeds from issuance of common stock |  |  |  |  |  | $ 700 |  |
Class B Common Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, issued during the period (in shares) |  |  | 0 | 0 | 0 | 0 |  |
Common stock, shares outstanding (in shares) |  |  | 45,884,000 |  | 45,884,000 |  |  | 45,884,000
Common stock, shares issued (in shares) |  |  | 45,884,000 |  | 45,884,000 |  |  | 45,884,000
Common stock value |  |  | $ 459 |  | $ 459 |  |  | $ 459
Class A Common Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, issued during the period (in shares) |  |  | 100,128 | 91,034 | 366,043 | 339,617 |  |
Common stock, shares outstanding (in shares) |  |  | 333,408,000 |  | 333,408,000 |  |  | 323,018,000
Common stock, shares issued (in shares) |  |  | 426,015,000 |  | 426,015,000 |  |  | 373,545,000
Common stock value |  |  | $ 4,260 |  | $ 4,260 |  |  | $ 3,735
Aggregate proceeds from issuance of common stock | $ 300,000 |  |  |  |  |  |  |
Company's repurchase and additional redemption authority amount |  |  |  |  |  |  | $ 400,000 |
Stock repurchase program and unit redemption remaining authorized amount |  |  | $ 322,800 |  | $ 322,800 |  |  |
New CEO Program | CF & Co |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, issued during the period (in shares) |  |  | 0 |  | 0 |  |  |
Payment percentage of the gross proceeds from the sale of shares |  | 2.00% |  |  |  |  |  |
New CEO Program | Class A Common Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Maximum amount under the controlled equity offering program |  | $ 300,000 |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  | 17,600,000 |  | 17,600,000 |  |  |
Common stock value |  |  | $ 210,800 |  | $ 210,800 |  |  |

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