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Revenue - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Unbilled service fees | $ 70,999 |  | $ 65,004
Unbilled outside vendor costs, billable to clients | 21,884 |  | 30,133
Advance billings | 157,101 |  | 171,742
Decrease in advance billings | (14,641) |  |
Revenue recognized |  | $ 127,961 | 190,342
Remaining performance obligation, amount | $ 14,556 |  |
Remaining performance obligation, current year, percentage | 66.00% |  |
Remaining performance obligation, year two, percentage | 31.00% |  |
Remaining performance obligation, year three, percentage | 3.00% |  |
Accrued Expenses and Other Current Liabilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Advance billings | $ 197,650 |  | $ 216,931
Decrease in advance billings | $ 19,281 |  |

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- Definition Gross amount of merchandise or goods which are partially completed, are generally comprised of raw materials, labor and factory overhead costs, and which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing. + References No definition available. + Details
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044 + Details
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- Definition Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References No definition available. + Details
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