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Income taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Contingency [Line Items] |  |  |
Cumulative unremitted earnings, non-permanently reinvested | $ 1,700,000 |  |
Cumulative unremitted earnings, permanently reinvested | $ 700,000 |  |
Effective income tax rate, total | 6.10% | (35.90%) | 10.60%
Increase (decrease) in deferred tax liability due to merger of foreign subsidiaries | $ (129,000) |  |
Realized net benefit as result of reducing our reserves with respect to uncertain tax positions | 1,700 | $ 100 | $ 800
Tax effect, carry forwards | 180,800 |  |
Deferred tax assets, valuation allowance | 155,008 | 119,233 |
Unrecognized tax benefits that would impact effective tax rate | 4,400 |  |
Unrecognized tax benefits, interest (benefit) expense | 200 | 200 | 200
Unrecognized tax benefits, penalties | (500) | (100) | $ (300)
Unrecognized tax benefits, interest (benefit) expense accrued | 600 | 600 |
Unrecognized tax benefits, penalties accrued | 2,100 | $ 2,200 |
Minimum |  |  |
Income Tax Contingency [Line Items] |  |  |
Unrecognized tax benefits change within next twelve months due to potential for resolution of foreign and U.S. examinations | 0 |  |
Maximum |  |  |
Income Tax Contingency [Line Items] |  |  |
Unrecognized tax benefits change within next twelve months due to potential for resolution of foreign and U.S. examinations | 700 |  |
No Expiration Date |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax effect, carry forwards | 14,400 |  |
After 2020 but before the end of 2025 |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax effect, carry forwards | 9,100 |  |
After 2025 |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax effect, carry forwards | $ 157,300 |  |

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- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible tax carryforwards, classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
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