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Fair Value Measurements - Fair Value Liabilities Measured on Recurring Basis (Detail) - Fair Value Measurements Recurring [Member] - Fair Value, Inputs, Level 3 [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Contingent consideration obligation – December 31, 2018 $ 49,000
Additions 98,000
Fair value adjustments 201,564
Payments (28,464)
Contingent consideration obligation – December 31, 2019 $ 320,100