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Accumulated other comprehensive income (loss) (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Schedule of accumulated other comprehensive income (loss) | The changes in accumulated other comprehensive income (loss) by component, for the three months ended March 31, 2018 are as follows:
| Foreign currency translation adjustments |  | Pensions, net of tax |  | Total
Balance as of December 31, 2017 | $ | (547,927 | ) |  | (10,600 | ) |  | (558,527 | )
Current period other comprehensive income | 71,494 |  |  | (135 | ) |  | 71,359 |
Balance as of March 31, 2018 | $ | (476,433 | ) |  | (10,735 | ) |  | (487,168 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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