Shareholders' Equity - Summary of Changes in Shareholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 3,864,869	$ 4,210,072
Net income	198,359	299,576
Purchase of common stock for treasury	(636,568)	(588,449)
Equity-based compensation	13,287	18,527
Proceeds from Options exercised	54,087	14,938
Ending Balance	3,494,034	3,954,664
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stockholders' Equity Attributable to Parent	3,494,034	3,954,664
Treasury Stock, Value, Acquired, Cost Method	636,568	588,449
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	206	206
Ending Balance	206	206
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stockholders' Equity Attributable to Parent	206	206
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	3,155,367	3,031,637
Equity-based compensation	13,287	18,527
Proceeds from Options exercised	54,087	14,938
Treasury stock issued upon Option exercise and RSU vesting	(20,099)	(8,065)
Ending Balance	3,202,642	3,057,037
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stockholders' Equity Attributable to Parent	3,202,642	3,057,037
Treasury stock issued upon Option exercise and RSU vesting	(20,099)	(8,065)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	16,386,769	15,046,953
Net income	198,359	299,576
Ending Balance	16,585,128	15,346,529
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stockholders' Equity Attributable to Parent	16,585,128	15,346,529
Treasury Stock, Common
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(15,677,473)	(13,868,724)
Purchase of common stock for treasury	(636,568)	(588,449)
Treasury stock issued upon Option exercise and RSU vesting	20,099	8,065
Ending Balance	(16,293,942)	(14,449,108)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stockholders' Equity Attributable to Parent	(16,293,942)	(14,449,108)
Treasury Stock, Value, Acquired, Cost Method	636,568	588,449
Treasury stock issued upon Option exercise and RSU vesting	20,099	8,065
Deferred Compensation Trust
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(16,710)	(16,710)
Ending Balance	(16,710)	(16,710)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stockholders' Equity Attributable to Parent	(16,710)	(16,710)
Deferred Compensation Liability
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	16,710	16,710
Ending Balance	16,710	16,710
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stockholders' Equity Attributable to Parent	$ 16,710	$ 16,710

NVR INC 10-Q