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Description of Business, Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($) shares in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit |  | $ (1,143,000,000) |  |  |  | $ (823,000,000) |  |  |  | $ (1,143,000,000) | $ (823,000,000) |
Increase in other assets |  | 91,000,000 |  |  |  | 54,000,000 |  |  |  | 91,000,000 | 54,000,000 | $ 17,000,000
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 7,000,000 | (3,000,000) | 125,000,000
Depreciation expense |  |  |  |  |  |  |  |  |  | 104,000,000 | 67,000,000 | $ 55,000,000
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  | $ 0 |  |
Antidilutive options to purchase were excluded from computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  |  | 115.5 |  | 127.8
Operating (loss) income |  | $ (5,000,000) | $ 10,000,000 | $ 10,000,000 | $ (5,000,000) | $ 23,000,000 | $ 14,000,000 | $ 10,000,000 | $ (4,000,000) | $ 10,000,000 | 43,000,000 | $ 68,000,000
Other expenses |  |  |  |  |  |  |  |  |  | $ 9,000,000 | $ 8,000,000 | $ 6,000,000
Internal-Use Software |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period capitalized on a straight-line basis when the asset is substantially ready for use |  |  |  |  |  |  |  |  |  | 3 years |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contract term |  |  |  |  |  |  |  |  |  | 1 month |  |
Fees payment term (in days) |  |  |  |  |  |  |  |  |  | 30 days |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contract term |  |  |  |  |  |  |  |  |  | 5 years |  |
Fees payment term (in days) |  |  |  |  |  |  |  |  |  | 90 days |  |
Equipment | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives (in years) |  |  |  |  |  |  |  |  |  | 3 years |  |
Equipment | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives (in years) |  |  |  |  |  |  |  |  |  | 5 years |  |
Building | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives (in years) |  |  |  |  |  |  |  |  |  | 25 years |  |
Building | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives (in years) |  |  |  |  |  |  |  |  |  | 45 years |  |
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive options to purchase were excluded from computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  |  | 2.0 | 2.6 | 2.7
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit | $ 19,000,000 |  |  |  |  |  |  |  |  |  |  |
Increase in other assets | 17,000,000 |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) | 10,000,000 |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Liability | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit | 26,000,000 |  |  |  |  |  |  |  |  |  |  |
Unbilled contract receivables | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |

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