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Stock Based Compensation - Status of United's Nonvested Stock Option Awards (Detail)	12 Months Ended
	Dec. 31, 2025 $ / shares shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares, Nonvested, Beginning balance	310,027
Shares, Granted	0
Weighted-Average Grant Date Fair Value Per Share, Nonvested Beginning balance | $ / shares	$ 36.58
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares, Nonvested, Beginning balance	490,119
Shares, Granted	256,385
Shares, Vested	(148,597)
Shares, Forfeited or expired	(2,422)
Shares, Nonvested, Ending balance	595,485
Weighted-Average Grant Date Fair Value Per Share, Nonvested Beginning balance | $ / shares	$ 35.41
Weighted-Average Grant Date Fair Value Per Share, Granted | $ / shares	35.35
Weighted-Average Grant Date Fair Value Per Share, Vested | $ / shares	35.81
Weighted-Average Grant Date Fair Value Per Share, Forfeited or expired | $ / shares	36.26
Weighted-Average Grant Date Fair Value Per Share, Nonvested Ending balance | $ / shares	$ 35.28

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