Acquisitions - Summary of Pro Forma Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Business Acquisition [Line Items]
Net sales, As reported	$ 2,144,051	$ 1,685,466
Net earnings, As reported	$ 33,961	$ 39,327
Diluted earnings per share, As reported	$ 0.95	$ 1.09
PCM [Member]
Business Acquisition [Line Items]
Net sales, As reported		$ 1,685,466
Net sales, Pro forma		2,218,774
Net earnings, As reported		39,327
Net earnings, Pro forma		$ 37,057
Diluted earnings per share, As reported		$ 1.09
Diluted earnings per share, Pro forma		$ 1.03