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Description of Business, Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) shares in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Jan. 01, 2019
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  |  |  |  | $ 67,000,000 | $ 55,000,000 | $ 49,000,000 |
Antidilutive options to purchase were excluded from computation of diluted earnings per share (in shares) | shares |  |  |  |  |  |  |  |  |  | 127.8 |  |
Operating (loss) income | $ 23,000,000 | $ 14,000,000 | $ 10,000,000 | $ (4,000,000) | $ 60,000,000 | $ 9,000,000 | $ (1,000,000) | $ 0 | 43,000,000 | $ 68,000,000 | 235,000,000 |
Impairment of long-lived assets |  |  |  |  |  |  |  |  | 0 |  |  |
Other expenses |  |  |  |  |  |  |  |  | $ 8,000,000 | $ 6,000,000 | $ 8,000,000 |
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 |  |  |
Capitalized Software |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets amortizable period |  |  |  |  |  |  |  |  | 4 years |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fees payment term (in days) |  |  |  |  |  |  |  |  | 30 days |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
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) | shares |  |  |  |  |  |  |  |  | 2.6 | 2.7 | 5.2 |
New Accounting Pronouncement, Early Adoption, Effect |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  | $ (4,000,000) | $ (3,000,000) |  |
Accounting Standards Update 2017-07 |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating (loss) income |  |  |  |  |  |  |  |  | 6,000,000 | 4,000,000 | $ 3,000,000 |
Other expenses |  |  |  |  |  |  |  |  | $ 6,000,000 | $ 4,000,000 | $ 3,000,000 |
Subsequent Event | Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Assets, estimated percentage increase |  |  |  |  |  |  |  |  |  |  |  | 0.03
Liabilities, estimated percentage increase |  |  |  |  |  |  |  |  |  |  |  | 0.04

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