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Leases - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating Leased Assets [Line Items] |  |  |
Operating lease, right of use asset | $ 73,597 | $ 85,538 |
Operating lease, liability | 95,141 |  |
Gain on partial lease termination | (2,820) | 0 | $ 0
UNITED STATES |  |  |
Operating Leased Assets [Line Items] |  |  |
Operating lease, right of use asset | 62,200 | 71,000 |
Operating lease, liability | 82,900 | 97,500 |
UNITED STATES | Northern Virginia Office Space |  |  |
Operating Leased Assets [Line Items] |  |  |
Operating lease, right of use asset | 59,000 | 66,900 |
Operating lease, liability | $ 79,700 | 93,300 |
Lease term expiration date | Dec. 31, 2030 |  |
Lease option to extend, description | option for the Company to extend the term for an additional five or 10 consecutive years |  |
Lease termination fees | $ 1,600 |  |
Reduction in right of use assets | 4,200 |  |
Reduction in lease liability | 7,000 |  |
Gain on partial lease termination | 2,800 |  |
Non-US |  |  |
Operating Leased Assets [Line Items] |  |  |
Operating lease, right of use asset | 11,400 | 14,500 |
Operating lease, liability | $ 12,200 | $ 15,500 |
Minimum | UNITED STATES | Northern Virginia Office Space |  |  |
Operating Leased Assets [Line Items] |  |  |
Lease extension term | 5 years |  |
Maximum | UNITED STATES | Northern Virginia Office Space |  |  |
Operating Leased Assets [Line Items] |  |  |
Lease extension term | 10 years |  |

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- Definition Lease termination fees. + References No definition available. + Details
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- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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