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Shareholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Nov. 12, 2019
Class of Stock [Line Items] |  |  |  |  |  |
Cash dividends received | $ 12,694 | $ 10,236 | $ 39,448 | $ 18,350 |  |
Repurchase of common stock (in shares) |  |  |  |  |  | 1,525,000
Shares repurchased as a percentage of total shares outstanding |  |  |  |  |  | 5.00%
Repurchase of common stock | $ 8,009 | $ 3,660 | 25,304 | 4,695 |  |
Market value of shares repurchased under equity compensation plans |  |  | $ 494 | $ 4,695 |  |
Minimum |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Company's common stock in lieu of cash to exercise options to purchase shares (in shares) | 11,306 |  | 11,439 |  |  |
Maximum |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Company's common stock in lieu of cash to exercise options to purchase shares (in shares) |  | 15,151 |  | 15,242 |  |
2007 Stock Repurchase Plan |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock repurchase program cumulative number of shares repurchased during the period (in shares) |  |  |  |  | 0 |
2019 Stock Repurchase Plan |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Cumulative number of shares repurchased (in shares) |  |  |  |  | 0 |
Repurchase of common stock (in shares) | 259,993 |  | 813,862 |  |  |
Repurchase of common stock | $ 7,669 |  | $ 24,809 |  |  |
Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Repurchase of common stock (in shares) | 271,299 | 93,755 | 829,969 | 119,914 |  |
Repurchase of common stock | $ 4,833 | $ 1,672 | $ 14,795 | $ 2,138 |  |
Common Stock | Minimum |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Company's common stock in lieu of cash to exercise options to purchase shares (in shares) | 0 |  | 4,668 |  |  |
Market value of shares repurchased under equity compensation plans | $ 346 |  | $ 494 |  |  |
Common Stock | Maximum |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Company's common stock in lieu of cash to exercise options to purchase shares (in shares) |  | 93,755 |  | 119,914 |  |
Market value of shares repurchased under equity compensation plans |  | $ 3,659 |  | $ 4,695 |  |

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