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Income taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Contingency [Line Items] |  |  |
Cumulative unremitted earnings, non-permanently reinvested | $ 471,200 |  |
Cumulative unremitted earnings | $ 1,214,900 |  |
Effective income tax rate, total | 3.30% | 3.20% | 13.00%
Realized net benefit as result of reducing our reserves with respect to uncertain tax positions | $ 8,800 | $ 4,600 | $ 1,800
Tax effect, carry forwards | $ 136,000 |  |
Percentage of change in ownership | 50.00% |  |
Deferred tax assets, valuation allowance | $ 104,520 | 103,475 |
Unrecognized tax benefits that would impact effective tax rate | 10,400 |  |
Unrecognized tax benefits, interest (benefit) expense | 200 | 1,600 | 1,000
Unrecognized tax benefits, penalties | (500) | (400) | $ (800)
Unrecognized tax benefits, interest (benefit) expense accrued | 700 | 6,500 |
Unrecognized tax benefits, penalties accrued | 2,700 | $ 3,200 |
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 | 6,500 |  |
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 | 1,600 |  |
After 2018 |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax effect, carry forwards | $ 123,400 |  |
Excess Tax Deductions |  |  |
Income Tax Contingency [Line Items] |  |  |
Effective income tax rate, total | 3.30% | 3.20% |

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