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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