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Interim Consolidated Financial Statements - Additional Information (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Summary Of Significant Accounting Policy [Line Items] |  |  |
Decrease in retained earnings | $ 125,554 |  | $ 118,147
Topic 326 [Member] |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Change in accounting principle, accounting standards update, adopted | true |  |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2020 |  |
ASU No. 2017-04 [Member] |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Change in accounting principle, accounting standards update, adopted | true |  |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2020 |  |
Change in accounting principle, accounting standards update, immaterial effect | true |  |
ASU No. 2018-13 [Member] |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Change in accounting principle, accounting standards update, adopted | true |  |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2020 |  |
Change in accounting principle, accounting standards update, immaterial effect | true |  |
ASU No. 2018-15 [Member] |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Change in accounting principle, accounting standards update, adopted | true |  |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2020 |  |
Change in accounting principle, accounting standards update, immaterial effect | true |  |
Cumulative Effect Adjustment [Member] | Topic 326 [Member] |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Decrease in retained earnings |  | $ (200) |

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