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Revenue and Related Contract Costs and Contract Liabilities - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue recognition description of capitalized contract costs |  |  | Capitalized contract costs are expensed upon the transfer of the related goods or services and are included in cost of services or cost of products, as applicable |
Capitalized contract costs to obtain contracts | $ 2,100,000 |  | $ 2,100,000 |
Capitalized contract costs to fulfill contracts | 22,100,000 |  | 22,100,000 |
Impairment loss on capitalized contract costs | $ 0 | $ 0 | $ 0 | $ 0
GES |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Performance obligation description of payment terms |  |  | Payment terms are generally within 30-60 days and contain no significant financing components |
GES | Minimum |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Performance obligation payment terms |  |  | 30 days |
GES | Maximum |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Performance obligation payment terms |  |  | 60 days |
Pursuit |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Performance obligation description of payment terms |  |  | When credit is extended, payment terms are generally within 30 days and contain no significant financing components |
Performance obligation payment terms |  |  | 30 days |

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- Definition Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Description of payment terms in contract with customer. Includes, but is not limited to, timing of payment, existence of financing component, variability of consideration and constraint on variable consideration. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130554-203045 + Details
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