Acquisitions - Summary of Pro Forma Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Net sales, As reported	$ 1,936,478	$ 1,912,547	$ 6,049,264	$ 5,434,034
Net earnings, As reported	$ 38,906	$ 27,132	$ 119,252	$ 116,457
Diluted earnings per share, As reported	$ 1.10	$ 0.76	$ 3.37	$ 3.23
PCM [Member]
Business Acquisition [Line Items]
Net sales, As reported		$ 1,912,547		$ 5,434,034
Net sales, Pro forma		2,322,828		6,910,356
Net earnings, As reported		27,132		116,457
Net earnings, Pro forma		$ 24,678		$ 115,321
Diluted earnings per share, As reported		$ 0.76		$ 3.23
Diluted earnings per share, Pro forma		$ 0.69		$ 3.20