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Income taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Contingency [Line Items] |  |  |
Provisional income tax (expense) benefit due to tax cuts and jobs act | $ 46,100 |  |
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense (benefit) | $ 154,000 |  |
Tax cuts and jobs act of 2017, incomplete accounting, expected period to pay provisional income tax expense (benefit) | 8 years |  |
Cumulative unremitted earnings, non-permanently reinvested | $ 2,000,000 |  |
Effective income tax rate, total | 45.50% | 3.30% | 3.20%
Deferred tax asset, income tax expense (benefit) due to tax cuts and jobs act of 2017 | $ 107,900 |  |
Tax cuts and jobs act of 2017, transition tax for accumulated foreign earnings, liability | 154,000 |  |
Realized net benefit as result of reducing our reserves with respect to uncertain tax positions | 5,200 | $ 8,800 | $ 4,600
Tax effect, carry forwards | $ 210,100 |  |
Percentage of change in ownership | 50.00% |  |
Deferred tax assets, valuation allowance | $ 104,799 | 104,520 |
Unrecognized tax benefits that would impact effective tax rate | 5,000 |  |
Unrecognized tax benefits, interest (benefit) expense | 200 | 200 | 1,600
Unrecognized tax benefits, penalties | (200) | (500) | $ (400)
Unrecognized tax benefits, interest (benefit) expense accrued | 600 | 700 |
Unrecognized tax benefits, penalties accrued | 2,600 | $ 2,700 |
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 | 11,500 |  |
After 2013 but before the end of 2018 |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax effect, carry forwards | 2,000 |  |
After 2018 |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax effect, carry forwards | $ 196,600 |  |
Excess Tax Deductions |  |  |
Income Tax Contingency [Line Items] |  |  |
Effective income tax rate, total | 45.50% | 3.30% |

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