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Common Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2017 | Nov. 30, 2014
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Cash dividends declared per share |  |  |  | $ 0.50 |
Dividends payable |  |  |  | $ 21,900 |
Dividend paid in cash |  |  | $ 21,911 |  |
Callcap Acquisition |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Business acquisition, percentage of voting interests acquired | 100.00% |  |  |  |
Cash paid for business acquisition | $ 24,993 |  |  |  |
Class B |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Number of shares authorized to be repurchased |  |  |  |  | 3,000,000
Treasury stock acquired, shares |  | 90,000 | 0 |  |
Treasury stock repurchased |  | $ 0.01 |  |  |
Treasury stock acquired, value |  | $ 900 | $ 0 |  |
Class B | Callcap Acquisition |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock issued during the period, shares | 3,400,000 |  |  |  |
Common stock issuance period | 4 years |  |  |  |

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