Earnings Per Share - Calculation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended			6 Months Ended
	Jan. 20, 2021	Mar. 31, 2021	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 183,756	$ 676,249	$ 138,712	$ 539,487	$ 20,349	$ 998,717	$ 559,836
Net income attributable to non-controlling interests			130,448			942,468
Net income attributable to UWM Holdings Corporation			8,264			56,249
Net income attributable to Class A common shareholders			8,264			56,249
Net income attributable to Class A common shareholders - diluted			$ 106,824			$ 630,992
Weighted average shares of Class A common stock outstanding - basic (in shares)			102,760,823			102,908,906
Weighted average shares of Class A common stock outstanding - diluted (in shares)			1,605,067,478			1,605,215,562
Earnings per share of Class A common stock outstanding - basic (in usd per share)			$ 0.08			$ 0.55
Earnings per share of Class A common stock outstanding - diluted (in usd per share)			$ 0.07			$ 0.39