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Acquisitions - Summary of Purchase Price and Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
9 Months Ended
Aug. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Business Acquisition [Line Items]        
Purchase price net of cash and cash equivalents acquired   $ 6,405,000 $ 664,287,000  
Fair value of net assets acquired:        
Excess purchase price over fair value of net assets acquired ("goodwill")   $ 425,800,000   $ 415,149,000
PCM [Member]        
Business Acquisition [Line Items]        
Purchase price net of cash and cash equivalents acquired $ 660,925,000      
Fair value of net assets acquired:        
Current assets 531,941,000      
Identifiable intangible assets - see description below 191,370,000      
Property and equipment 91,213,000      
Other assets 32,699,000      
Current liabilities (369,183,000)      
Long-term liabilities, including deferred taxes (71,009,000)      
Total fair value of net assets acquired 407,031,000      
Excess purchase price over fair value of net assets acquired ("goodwill") $ 253,894,000