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Shareholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Nov. 12, 2019
Class of Stock [Line Items] |  |  |  |  |  |
Cash dividends received | $ 6,913 | $ 7,011 | $ 46,361 | $ 25,361 |  |
Repurchase of common stock (in shares) |  |  |  |  |  | 1,525,000
Shares repurchased as a percentage of total shares outstanding |  |  |  |  |  | 500.00%
Repurchase of common stock | $ 242 | $ 147 | 25,545 | 4,842 |  |
Market value of shares repurchased under equity compensation plans |  |  | $ 736 | $ 4,842 |  |
Minimum |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Company's common stock in lieu of cash to exercise options to purchase shares (in shares) | 619 |  | 12,058 |  |  |
Maximum |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Company's common stock in lieu of cash to exercise options to purchase shares (in shares) |  | 0 |  | 15,242 |  |
2007 Stock Repurchase Plan |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  |  |  | 0 |
2019 Stock Repurchase Plan |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Repurchase of common stock (in shares) | 0 |  | 813,862 |  | 0 |
Repurchase of common stock | $ 0 |  | $ 24,809 |  |  |
Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Repurchase of common stock (in shares) | 8,439 | 3,820 | 838,408 | 123,734 |  |
Repurchase of common stock | $ 151 | $ 68 | $ 14,946 | $ 2,206 |  |
Common Stock | Minimum |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Company's common stock in lieu of cash to exercise options to purchase shares (in shares) | 7,820 |  | 12,488 |  |  |
Market value of shares repurchased under equity compensation plans | $ 242 |  | $ 588 |  |  |
Common Stock | Maximum |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Company's common stock in lieu of cash to exercise options to purchase shares (in shares) |  | 3,820 |  | 108,492 |  |
Market value of shares repurchased under equity compensation plans |  | $ 147 |  | $ 4,842 |  |

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