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Income taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Contingency [Line Items] |  |  |
Cumulative unremitted earnings, non-permanently reinvested | $ 481,700 |  |
Cumulative unremitted earnings | $ 1,100,600 |  |
Effective income tax rate, total | 3.20% | 13.02% | 13.40%
Realized net benefit as result of reducing our reserves with respect to uncertain tax positions | $ 4,600 | $ 1,800 | $ 7,100
Tax effect, carry forwards | $ 123,300 |  |
Percentage of change in ownership | 50.00% |  |
Deferred tax assets, valuation allowance | $ 103,475 | 99,141 |
Unrecognized tax benefits that would impact effective tax rate | 17,700 |  |
Unrecognized tax benefits, interest (benefit) expense | 1,600 | 1,000 | 1,300
Unrecognized tax benefits, penalties | (400) | (800) | $ (800)
Unrecognized tax benefits, interest (benefit) expense accrued | 6,500 | 6,200 |
Unrecognized tax benefits, penalties accrued | 3,200 | $ 5,000 |
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 | 7,400 |  |
No Expiration Date |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax effect, carry forwards | 10,500 |  |
After 2013 but before the end of 2018 |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax effect, carry forwards | 800 |  |
After 2018 |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax effect, carry forwards | $ 112,000 |  |
Excess Tax Deductions |  |  |
Income Tax Contingency [Line Items] |  |  |
Effective income tax rate, total | 3.20% | 13.00% |

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