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Fair Value Measurements - Carrying Value and Fair Value of Debt (Parenthetical) (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Sep. 30, 2019
Mar. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Term loan maturity period 2019-03  
Revolving Credit [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Line of credit facility, maximum borrowing capacity   $ 1,250
Term loan maturity period   2024-09