Dividends (Parenthetical) (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Supplemental Cash Flow Elements [Abstract] | |||
| Dividends related to outstanding restricted stock units | $ 256 | $ 670 | $ 624 |
| X | ||||||||||
- Definition Amount of dividends accrued on unvested restricted stock units to be paid upon vesting. No definition available.
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| X | ||||||||||
- References No definition available.
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