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Leases - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Operating Leased Assets [Line Items] |  |  |
Operating lease, right of use asset | $ 79,296 |  | $ 85,538
Right of use asset obtained in exchange for operating lease liability | 700 | $ 5,000 |
UNITED STATES |  |  |
Operating Leased Assets [Line Items] |  |  |
Operating lease, right of use asset | 67,600 |  | 71,000
Operating lease, liability | 93,100 |  | 97,500
UNITED STATES | Northern Virginia Office Space |  |  |
Operating Leased Assets [Line Items] |  |  |
Operating lease, right of use asset | 64,100 |  | 66,900
Operating lease, liability | 89,600 |  | 93,300
Non-US |  |  |
Operating Leased Assets [Line Items] |  |  |
Operating lease, right of use asset | 11,700 |  | 14,500
Operating lease, liability | $ 12,600 |  | $ 15,500

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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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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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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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Balance Type: | debit
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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- Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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