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Valuation And Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for Credit Losses |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at the beginning of the period |  | $ 1,637 | $ 5,489 | $ 4,190
Additions | [1] | 1,550 | 124 | 1,912
Deduction |  | (427) | (3,976) | (613)
Balance at the end of the period |  | 2,760 | 1,637 | 5,489
Valuation Allowance of Deferred Tax Assets |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at the beginning of the period |  | 2,130 | 1,507 | 1,015
Additions | [1] | 10 | 633 | 492
Deduction |  | (881) | (10) | 0
Balance at the end of the period |  | $ 1,259 | $ 2,130 | $ 1,507
[1] | Reductions in/charges to revenues and expenses.

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