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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Commitments And Contingencies [Line Items] |  |
Surety bonds outstanding | $ 2,153,618 |
Surety Bond [Member] |  |
Commitments And Contingencies [Line Items] |  |
Surety bonds outstanding | $ 7,500 | $ 500

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