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Stock Transactions and Unit Redemptions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 09, 2018 | Dec. 13, 2017 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Aug. 01, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program and unit redemption remaining authorized amount |  |  | $ 255,365 |  | $ 255,365 |  |  |
CF & Co [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, issued during the period |  |  | 0 | 0 | 200,000 | 900,000 |  |
Payment percentage of the gross proceeds from the sale of shares |  | 5.50% |  |  |  |  |  |
Aggregate proceeds from issuance of common stock |  |  |  |  | $ 700 | $ 5,300 |  |
Weighted-average price per share |  |  |  |  | $ 4.04 | $ 6.17 |  |
Maximum [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Payment percentage of the gross proceeds from the sale of shares | 2.00% |  |  |  |  |  |  |
Class B Common Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, issued during the period |  |  | 0 | 0 | 0 | 0 |  |
Common stock outstanding |  |  | 45,884,380 |  | 45,884,380 |  | 45,884,380 |
Common stock, shares issued |  |  | 45,884,000 |  | 45,884,000 |  | 45,884,000 |
Common stock value issued |  |  | $ 459 |  | $ 459 |  | $ 459 |
Class A Common Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, issued during the period |  |  | 176,920 | 46,785 | 248,583 | 108,427 |  |
Common stock outstanding |  |  | 313,323,000 |  | 313,323,000 |  | 307,915,000 |
Common stock, shares issued |  |  | 363,848,000 |  | 363,848,000 |  | 358,440,000 |
Common stock value issued |  |  | $ 3,638 |  | $ 3,638 |  | $ 3,584 |
Company's repurchase and additional redemption authority amount |  |  |  |  |  |  |  | $ 300,000
Stock repurchase program and unit redemption remaining authorized amount |  |  | $ 255,400 |  | $ 255,400 |  |  |
Class A Common Stock [Member] | CF & Co [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, issued during the period |  |  | 0 |  |  |  |  |
Class A Common Stock [Member] | New CEO Program [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Maximum amount under the controlled equity offering program | $ 300,000 |  |  |  |  |  |  |
Common stock, shares issued |  |  | 17,600,000 |  | 17,600,000 |  |  |
Common stock value issued |  |  | $ 210,600 |  | $ 210,600 |  |  |

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