Consolidated Statements of Stockholders' Equity and Temporary Equity - Redeemable Noncontrolling Interest - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Temporary Equity - Redeemable Noncontrolling Interest
BALANCE at Dec. 31, 2020	$ 1,195,040	$ 805	$ 116,039	$ 1,438,916	$ (22,833)	$ (337,887)	$ 0
Net income attributable to Werner	118,524	0	0	118,524	0	0	0
Other comprehensive income (loss)	1,960	0	0	0	1,960	0	0
Purchases of common stock	(5,507)	0	0	0	0	(5,507)	0
Dividends on common stock	(14,943)	0	0	(14,943)	0	0	0
Equity compensation activity	(3,740)	0	(4,219)	0	0	479	0
Non-cash equity compensation expense	5,249	0	5,249	0	0	0	0
BALANCE at Jun. 30, 2021	1,296,583	805	117,069	1,542,497	(20,873)	(342,915)	0
BALANCE at Mar. 31, 2021	1,227,730	805	114,588	1,478,616	(23,098)	(343,181)	0
Net income attributable to Werner	72,032	0	0	72,032	0	0	0
Other comprehensive income (loss)	2,225	0	0	0	2,225	0	0
Dividends on common stock	(8,151)	0	0	(8,151)	0	0	0
Equity compensation activity	0	0	(266)	0	0	266	0
Non-cash equity compensation expense	2,747	0	2,747	0	0	0	0
BALANCE at Jun. 30, 2021	1,296,583	805	117,069	1,542,497	(20,873)	(342,915)	0
BALANCE at Dec. 31, 2021	1,327,550	805	121,904	1,667,104	(20,604)	(441,659)	35,947
Net income attributable to Werner	126,039	0	0	126,039	0	0	0
Net income attributable to noncontrolling interest	0	0	0	0	0	0	2,605
Other comprehensive income (loss)	6,020	0	0	0	6,020	0	0
Purchases of common stock	(102,113)	0	0	0	0	(102,113)	0
Dividends on common stock	(16,051)	0	0	(16,051)	0	0	0
Equity compensation activity	(3,658)	0	(3,924)	0	0	266	0
Non-cash equity compensation expense	6,085	0	6,085	0	0	0	0
BALANCE at Jun. 30, 2022	1,343,872	805	124,065	1,777,092	(14,584)	(543,506)	38,552
BALANCE at Mar. 31, 2022	1,341,464	805	121,157	1,713,046	(15,820)	(477,724)	37,233
Net income attributable to Werner	72,290	0	0	72,290	0	0	0
Net income attributable to noncontrolling interest	0	0	0	0	0	0	1,319
Other comprehensive income (loss)	1,236	0	0	0	1,236	0	0
Purchases of common stock	(65,933)	0	0	0	0	(65,933)	0
Dividends on common stock	(8,244)	0	0	(8,244)	0	0	0
Equity compensation activity	0	0	(151)	0	0	151	0
Non-cash equity compensation expense	3,059	0	3,059	0	0	0	0
BALANCE at Jun. 30, 2022	$ 1,343,872	$ 805	$ 124,065	$ 1,777,092	$ (14,584)	$ (543,506)	$ 38,552