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Goodwill and Intangibles - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill impairment $ 0 $ 0 $ 0
Intangible asset impairment 0 0 0
Increase in gross carrying amount of intangibles 28,300,000 37,300,000  
Amortization expense on intangible assets 24,510,000 25,419,000 26,857,000
Intangibles on business combination $ 28,041,000 $ 36,085,000 $ 76,816,000