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Income taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Contingency [Line Items] |  |  |
Provisional income tax (expense) benefit due to tax cuts and jobs act | $ 2,300 | $ 46,100 |
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense (benefit) | $ 154,000 | $ 154,000 |
Tax cuts and jobs act of 2017, incomplete accounting, expected period to pay provisional income tax expense (benefit) | 8 years |  |
Tax Cuts and Jobs Act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional liability | $ 200 |  |
Tax Cuts and Jobs Act of 2017, incomplete accounting, change in tax rate, provisional income tax expense (benefit) | (2,100) |  |
Tax Cuts and Jobs Act of 2017, income tax expense (benefit) | 10,700 |  |
Cumulative unremitted earnings, non-permanently reinvested | 2,100,000 |  |
Cumulative unremitted earnings, permanently reinvested | $ 200,000 |  |
Effective income tax rate, total | 10.60% | 45.50% | 3.30%
Deferred tax asset, income tax expense (benefit) due to tax cuts and jobs act of 2017 |  | $ 107,900 |
Realized net benefit as result of reducing our reserves with respect to uncertain tax positions | $ 800 | 5,200 | $ 8,800
Tax effect, carry forwards | $ 234,900 |  |
Percentage of change in ownership | 50.00% |  |
Deferred tax assets, valuation allowance | $ 143,971 | 104,799 |
Unrecognized tax benefits that would impact effective tax rate | 4,500 |  |
Unrecognized tax benefits, interest (benefit) expense | 200 | 200 | 200
Unrecognized tax benefits, penalties | (300) | (200) | $ (500)
Unrecognized tax benefits, interest (benefit) expense accrued | 600 | 600 |
Unrecognized tax benefits, penalties accrued | 2,200 | $ 2,600 |
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 | 1,600 |  |
No Expiration Date |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax effect, carry forwards | 11,000 |  |
After 2013 but before the end of 2018 |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax effect, carry forwards | 3,700 |  |
After 2018 |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax effect, carry forwards | $ 220,200 |  |
Excess Tax Deductions |  |  |
Income Tax Contingency [Line Items] |  |  |
Effective income tax rate, total | 10.60% | 45.50% |

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