Common and Preferred Stock Issued / Common Stock Issuable (Detail Textuals) - USD ($) $ in Millions		6 Months Ended
	Jul. 01, 2016	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2016	Mar. 22, 2016	Dec. 31, 2015
Subsequent Event [Line Items]
Number of shares repurchased under the program		460,000
Shares issued in connection with DRIP		1,775	997
Discount offered to employees under United has an Employee Stock Purchase Program (ESPP) to purchase shares of common stock		10.00%
Number of stock issued through ESPP		8,585	6,664
Common stock issuable shares under deferred compensation plan		486,753				458,953
Common stock, shares authorized		150,000,000		100,000,000		150,000,000
Shares repurchased authorized amount					$ 50.0
Value of common stock may be repurchased		$ 41.8
Subsequent event
Subsequent Event [Line Items]
Number of shares repurchased under the program	304,000