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Segment Reporting - Narrative (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) subsidiary | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) segment subsidiary | Jun. 30, 2020 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | segment |  |  | 3 |
Equity income (note 14 and 6b) | $ | $ 28,111 | $ 35,343 | $ 65,268 | $ 37,656
Publicly traded subsidiaries |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of Subsidiaries | subsidiary | 2 |  | 2 |

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