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v3.19.1

Subsequent Events - Additional Information (Detail) - Subsequent Event [Member] - USD ($) $ / shares in Units, $ in Millions | May 06, 2019 | Apr. 19, 2019 | Apr. 08, 2019
--- | --- | --- | ---
Secured Loan Arrangements [Member] | 3.77% [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt instrument gross amount |  |  | $ 15.0
Stated interest rate |  |  | 3.77%
Debt maturity year |  |  | Apr. 08, 2023
Secured Loan Arrangements [Member] | 3.89% [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Debt instrument gross amount |  | $ 10.0 |
Stated interest rate |  | 3.89% |
Debt maturity year |  | Apr. 19, 2023 |
Class A Common Stock [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Dividend declared per share | $ 0.14 |  |
Dividend payable declared date | May 06, 2019 |  |
Dividend payable, date to be paid | Jun. 10, 2019 |  |
Dividend payable record date | May 24, 2019 |  |
Class B Common Stock [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Dividend declared per share | $ 0.14 |  |
Dividend payable declared date | May 06, 2019 |  |
Dividend payable, date to be paid | Jun. 10, 2019 |  |
Dividend payable record date | May 24, 2019 |  |

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