Fair Value Measurements - Other Financial Instruments (Details) - Senior Notes - Level 2 - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Carrying Amount
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Long-term debt, fair value	$ 2,981,975	$ 2,785,326
Estimated Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Long-term debt, fair value	3,005,945	2,761,774
2025 Senior Notes, due 11/15/25 \| Carrying Amount
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Long-term debt, fair value	0	798,084
2025 Senior Notes, due 11/15/25 \| Estimated Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Long-term debt, fair value	0	797,080
2027 Senior Notes, due 6/15/27 \| Carrying Amount
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Long-term debt, fair value	498,736	497,870
2027 Senior Notes, due 6/15/27 \| Estimated Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Long-term debt, fair value	502,120	494,080
2029 Senior Notes, due 4/15/29 \| Carrying Amount
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Long-term debt, fair value	697,120	696,245
2029 Senior Notes, due 4/15/29 \| Estimated Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Long-term debt, fair value	695,205	675,206
2030 Senior Notes, due 2/1/30 \| Carrying Amount
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Long-term debt, fair value	794,324	793,127
2030 Senior Notes, due 2/1/30 \| Estimated Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Long-term debt, fair value	810,040	795,408
2031 Senior Notes, due 3/15/31 \| Carrying Amount
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Long-term debt, fair value	991,795	0
2031 Senior Notes, due 3/15/31 \| Estimated Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Long-term debt, fair value	$ 998,580	$ 0

UWM Holdings Corp 10-K