Share-Based Compensation (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Unearned non-cash share-based compensation
Weighted average period for recognition of share-based compensation expense	2 years 1 month 6 days
Unearned non-cash share-based compensation expense expected to be recognized	$ 6,500,000
Estimated forfeiture rate (as a percent)	2.00%
Options | UHS Holdco, Inc., (Parent)
Number of Options
Outstanding at the beginning of the period (in shares)	36,668
Granted (in shares)	6,150	0
Forfeited or expired (in shares)	(3,971)
Outstanding at the end of the period (in shares)	38,847		36,668
Exercisable at the end of the period (in shares)	26,209
Remaining authorized options available for issue	4,839
Weighted average exercise price
Outstanding at the beginning of the period (in dollars per share)	$ 1.12
Granted (in dollars per share)	$ 1.40
Forfeited or expired (in dollars per share)	$ 1.05
Outstanding at the end of the period (in dollars per share)	$ 1.17		$ 1.12
Exercisable at the end of the period (in dollars per share)	$ 1.05
Aggregate intrinsic value
Outstanding	9,838,000		11,253,000
Exercisable	$ 9,661,000
Weighted average remaining contractual term
Outstanding	6 years		5 years 7 months 6 days
Exercisable	4 years 4 months 24 days