Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Related Party Transaction [Line Items]
Selling, general and administrative expenses	$ 146,707	$ 139,901	$ 433,848	$ 417,896
Related Party
Related Party Transaction [Line Items]
Selling, general and administrative expenses	$ 300	$ 400	$ 800	$ 1,100
Distribution Solutions Group | LKCM Headwater Operations, LLC | Significant Shareholder
Related Party Transaction [Line Items]
Shares owned by related party (in shares)	36,357,588		36,357,588
Noncontrolling ownership (as a percent)	78.50%		78.50%