CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Net Income	$ 17,934	$ 12,012	$ 69,741	$ 59,088
Other Comprehensive Income (Loss), net	(45)	(154)	206	201
Comprehensive Income	17,889	11,858	69,947	59,289
Less:
Preferred Stock Dividends of Subsidiary, Noncontrolling Interests	10	13	26	39
Comprehensive Income attributable to UIL Holdings	$ 17,879	$ 11,845	$ 69,921	$ 59,250