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Goodwill (Tables) | 6 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill |
| Six months ended |  |  | Year ended |
| June 30, 2018 |  |  | December 31, 2017 |
| (in thousands)
Opening balance | $ | 769,058 |  |  | $ | 616,088 |
Current period acquisitions (Note 6) | — |  |  | 129,222 |
Prior period acquisitions (Note 6) | 122 |  |  | 1,393 |
Foreign exchange movement | (10,043 | ) |  | 22,355 |
Closing balance | $ | 759,137 |  |  | $ | 769,058 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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