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Recent Accounting Pronouncements (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($) | Jan. 01, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase (decrease) in revenues | $ 382,690 | $ 324,002 | $ 1,108,395 | $ 919,243 |
Number of operating segments | segment |  |  | 3,000 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase (decrease) in revenues | 10,387 |  | $ 31,598 |  |
Fleet Solutions And Travel And Corporate Solutions | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase (decrease) in revenues | 13,800 |  | 44,900 |  |
Operating expenses | 13,800 |  | 44,900 |  |
Travel and corporate solutions |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase (decrease) in revenues | 82,810 | 61,026 | 225,353 | 163,739 |
Travel and corporate solutions | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase (decrease) in revenues | (3,400) |  | (13,500) |  |
Operating expenses | (3,400) |  | (13,500) |  |
Health and Employee Benefit Solutions |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase (decrease) in revenues | $ 50,268 | $ 50,898 | $ 161,595 | $ 152,299 |
Health and Employee Benefit Solutions | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative-effect adjustment |  |  |  |  | $ 600

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