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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2018
Revenue from Contract with Customer [Abstract] |
Schedule of Disaggregation of Revenue | Revenue disaggregated by customer profile is as follows:
| Three Months Ended |  | Six Months Ended
| June 30, 2018 | June 30, 2017 |  | June 30, 2018 | June 30, 2017
| (in thousands) |  | (in thousands)
Top client | $ | 90,526 |  | $ | 86,239 |  |  | $ | 156,344 |  | $ | 190,922 |
Clients 2-5 | 168,305 |  | 92,852 |  |  | 336,773 |  | 183,163 |
Clients 6-10 | 104,301 |  | 52,853 |  |  | 221,366 |  | 106,283 |
Clients 11-25 | 125,758 |  | 79,633 |  |  | 246,065 |  | 149,008 |
Other | 152,720 |  | 119,446 |  |  | 301,187 |  | 233,601 |
Total | $ | 641,610 |  | $ | 431,023 |  |  | $ | 1,261,735 |  | $ | 862,977 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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