SEGMENT REPORTING (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 operating_segments	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Number of business segments (in segments)	2
Summarized information by operating segment [Abstract]
Revenues	$ 440,943,000	$ 349,936,000	$ 251,738,000
Property and equipment, net	57,719,000	46,308,000
Goodwill	718,587,000	718,078,000	91,784,000
Reconciliation of EBITDA to net income [Abstract]
EBITDA	94,212,000	60,192,000	34,623,000
Purchase amortization in cost of revenues	(11,883,000)	(8,634,000)	(1,353,000)
Purchase amortization in operating expenses	(15,183,000)	(13,607,000)	(2,237,000)
Depreciation and other amortization	(12,992,000)	(10,511,000)	(9,262,000)
Interest income	326,000	526,000	798,000
Interest expense	(6,943,000)	(4,832,000)	0
Income tax expense, net	(17,803,000)	(13,219,000)	(7,913,000)
Net income	29,734,000	9,915,000	14,656,000
Reconciliation of operating segment assets to total assets [Abstract]
Total operating segment assets	1,354,756,000	1,256,882,000
Investment in subsidiaries	(18,344,000)	(18,344,000)
Intersegment receivables	(79,430,000)	(73,399,000)
Total assets	1,256,982,000	1,165,139,000
Reconciliation of operating segment liabilities to total liabilities [Abstract]
Total operating segment liabilities	403,892,000	405,963,000
Intersegment payables	(74,772,000)	(67,167,000)
Total liabilities	329,120,000	338,796,000
United States [Member]
Segment Reporting Information [Line Items]
Corporate allocation US	800,000	0	0
Summarized information by operating segment [Abstract]
Revenues	420,817,000	330,805,000	233,381,000
Property and equipment, net	53,733,000	42,480,000
Goodwill	692,639,000	692,639,000	67,465,000
Reconciliation of EBITDA to net income [Abstract]
EBITDA	97,348,000	70,199,000	38,099,000
Reconciliation of operating segment assets to total assets [Abstract]
Total operating segment assets	1,311,292,000	1,215,949,000
Reconciliation of operating segment liabilities to total liabilities [Abstract]
Total operating segment liabilities	324,626,000	335,855,000
International [Member]
Segment Reporting Information [Line Items]
Corporate allocation	400,000	5,300,000	800,000
Summarized information by operating segment [Abstract]
Revenues	20,465,000	20,645,000	19,497,000
Property and equipment, net	3,986,000	3,828,000
Goodwill	25,948,000	25,439,000	24,319,000
Reconciliation of EBITDA to net income [Abstract]
EBITDA	(3,136,000)	(10,007,000)	(3,476,000)
Reconciliation of operating segment assets to total assets [Abstract]
Total operating segment assets	43,464,000	40,933,000
Reconciliation of operating segment liabilities to total liabilities [Abstract]
Total operating segment liabilities	79,266,000	70,108,000
External Customers [Member]
Summarized information by operating segment [Abstract]
Revenues	20,126,000	19,131,000	18,357,000
Intersegment Revenue [Member]
Summarized information by operating segment [Abstract]
Revenues	339,000	1,514,000	1,140,000
Intersegment Elimination [Member]
Summarized information by operating segment [Abstract]
Revenues	$ (339,000)	$ (1,514,000)	$ (1,140,000)