BUSINESS COMBINATION (Details) (USD $)	3 Months Ended		9 Months Ended			0 Months Ended	3 Months Ended			9 Months Ended			0 Months Ended			0 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Jun. 17, 2014 EQ	Sep. 30, 2014 EQ	Sep. 30, 2014 EQ	Sep. 30, 2013 EQ	Sep. 30, 2014 EQ	Sep. 30, 2013 EQ	Jun. 17, 2014 EQ	Jun. 30, 2014 EQ Previously Reported	Jun. 30, 2014 EQ Previously Reported	Sep. 30, 2014 EQ Adjustments	Jun. 17, 2014 EQ Permits and licenses	Jun. 17, 2014 EQ Permits and licenses	Jun. 17, 2014 EQ Customer relationships	Jun. 17, 2014 EQ Customer relationships	Jun. 17, 2014 EQ Tradename	Jun. 17, 2014 EQ Tradename	Jun. 17, 2014 EQ Customer backlog	Jun. 17, 2014 EQ Customer backlog	Jun. 17, 2014 EQ Non-compete agreements	Jun. 17, 2014 EQ Non-compete agreements	Jun. 17, 2014 EQ Internet domain and website	Jun. 17, 2014 EQ Internet domain and website	Jun. 17, 2014 EQ Database	Jun. 17, 2014 EQ Database
BUSINESS ACQUISITIONS
Percentage of outstanding shares acquired												100.00%
Payment to acquire business, net of cash acquired			$ 465,895,000			$ 465,900,000
Amount of term loan which was used to funded acquisition												415,000,000
Consideration paid and the fair value of assets acquired and liabilities assumed
Current assets							113,199,000	113,199,000		113,199,000				114,227,000	(1,028,000)
Property and equipment							103,532,000	103,532,000		103,532,000				103,532,000
Identifiable intangible assets							250,900,000	250,900,000		250,900,000				250,900,000			119,500,000		115,000,000		9,900,000		3,600,000		1,400,000		900,000		600,000
Current liabilities							(57,438,000)	(57,438,000)		(57,438,000)				(56,550,000)	(888,000)
Other liabilities							(131,159,000)	(131,159,000)		(131,159,000)				(131,336,000)	177,000
Total identifiable net assets							279,034,000	279,034,000		279,034,000				280,773,000	(1,739,000)
Goodwill	213,359,000		213,359,000		21,693,000		192,633,000	192,633,000		192,633,000				190,894,000	1,739,000
Total purchase price							471,667,000						471,667,000
Additional information
Weighted average amortization period						29 years										45 years		15 years		4 years		10 years		1 year		19 years		15 years
Revenue	170,894,000	53,090,000	290,272,000	141,766,000			111,300,000	125,900,000
Net income	13,333,000	10,328,000	29,558,000	22,944,000			10,500,000	12,000,000
Acquisition-related costs included in selling, general and administrative expenses							307,000			5,600,000
Pro forma combined:
Revenue							170,894,000		148,704,000	458,091,000	381,159,000
Net income							$ 13,333,000		$ 9,606,000	$ 24,835,000	$ 19,246,000
Earnings per share - Basic (in dollars per share)							$ 0.62		$ 0.52	$ 1.15	$ 1.05
Earnings per share - Diluted (in dollars per share)							$ 0.61		$ 0.52	$ 1.15	$ 1.04