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Acquisitions - Summary of Purchase Price and Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
12 Months Ended
Aug. 30, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]        
Purchase price net of cash and cash equivalents acquired   $ 0 $ 6,405 $ 664,287
Fair value of net assets acquired:        
Excess purchase price over fair value of net assets acquired ("goodwill")   $ 428,346 $ 429,368  
PCM        
Business Acquisition [Line Items]        
Purchase price net of cash and cash equivalents acquired $ 660,925      
Fair value of net assets acquired:        
Current assets 531,941      
Identifiable intangible assets 191,370      
Property and equipment 91,213      
Other assets 32,699      
Current liabilities (369,183)      
Long-term liabilities, including deferred taxes (71,009)      
Total fair value of net assets acquired 407,031      
Excess purchase price over fair value of net assets acquired ("goodwill") $ 253,894