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SEGMENT REPORTING (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 operating_segments | Sep. 30, 2012 | 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 | $ 112,301,000 | $ 96,001,000 | $ 325,333,000 | $ 249,853,000 |  |
Property and equipment, net | 55,703,000 |  | 55,703,000 |  | 46,308,000 |
Goodwill | 718,039,000 |  | 718,039,000 |  | 718,078,000 | 91,784,000
Reconciliation of EBITDA to net income (loss) [Abstract] |  |  |  |  |  |
EBITDA | 29,792,000 | 19,641,000 | 62,692,000 | 39,734,000 |  |
Purchase amortization in cost of revenues | (2,954,000) | (3,027,000) | (9,007,000) | (5,607,000) |  |
Purchase amortization in operating expenses | (3,680,000) | (4,824,000) | (11,699,000) | (9,038,000) |  |
Depreciation and other amortization | (3,388,000) | (2,844,000) | (9,531,000) | (7,554,000) |  |
Interest income | 52,000 | 59,000 | 239,000 | 440,000 |  |
Interest expense | (1,736,000) | (1,822,000) | (5,249,000) | (3,022,000) |  |
Income tax expense, net | (7,034,000) | (404,000) | (10,510,000) | (9,752,000) |  |
Net income | 11,052,000 | 6,779,000 | 16,935,000 | 5,201,000 |  |
Reconciliation of operating segment assets to total assets [Abstract] |  |  |  |  |  |
Total operating segment assets | 1,327,742,000 |  | 1,327,742,000 |  | 1,256,882,000 |
Investment in subsidiaries | (18,344,000) |  | (18,344,000) |  | (18,344,000) |
Intersegment receivables | (79,024,000) |  | (79,024,000) |  | (73,399,000) |
Total assets | 1,230,374,000 |  | 1,230,374,000 |  | 1,165,139,000 |
Reconciliation of operating segment liabilities to total liabilities [Abstract] |  |  |  |  |  |
Total operating segment liabilities | 404,059,000 |  | 404,059,000 |  | 405,963,000 |
Intersegment payables | (73,004,000) |  | (73,004,000) |  | (67,167,000) |
Total liabilities | 331,055,000 |  | 331,055,000 |  | 338,796,000 |
United States [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
U.S. corporate allocation | 300,000 | 0 | 600,000 | 0 |  |
Summarized information by operating segment [Abstract] |  |  |  |  |  |
Revenues | 107,230,000 | 91,153,000 | 310,762,000 | 235,606,000 |  |
Property and equipment, net | 51,781,000 |  | 51,781,000 |  | 42,480,000 |
Goodwill | 692,639,000 |  | 692,639,000 |  | 692,639,000 | 67,465,000
Reconciliation of EBITDA to net income (loss) [Abstract] |  |  |  |  |  |
EBITDA | 30,855,000 | 22,688,000 | 66,609,000 | 46,302,000 |  |
Reconciliation of operating segment assets to total assets [Abstract] |  |  |  |  |  |
Total operating segment assets | 1,285,779,000 |  | 1,285,779,000 |  | 1,215,949,000 |
Reconciliation of operating segment liabilities to total liabilities [Abstract] |  |  |  |  |  |
Total operating segment liabilities | 326,850,000 |  | 326,850,000 |  | 335,855,000 |
International [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
International corporate allocation | 100,000 | 2,300,000 | 300,000 | 4,500,000 |  |
Summarized information by operating segment [Abstract] |  |  |  |  |  |
Revenues | 5,202,000 | 5,236,000 | 14,848,000 | 15,401,000 |  |
Property and equipment, net | 3,922,000 |  | 3,922,000 |  | 3,828,000 |
Goodwill | 25,400,000 |  | 25,400,000 |  | 25,439,000 | 24,319,000
Reconciliation of EBITDA to net income (loss) [Abstract] |  |  |  |  |  |
EBITDA | (1,063,000) | (3,047,000) | (3,917,000) | (6,568,000) |  |
Reconciliation of operating segment assets to total assets [Abstract] |  |  |  |  |  |
Total operating segment assets | 41,963,000 |  | 41,963,000 |  | 40,933,000 |
Reconciliation of operating segment liabilities to total liabilities [Abstract] |  |  |  |  |  |
Total operating segment liabilities | 77,209,000 |  | 77,209,000 |  | 70,108,000 |
External Customers [Member] |  |  |  |  |  |
Summarized information by operating segment [Abstract] |  |  |  |  |  |
Revenues | 5,071,000 | 4,848,000 | 14,571,000 | 14,247,000 |  |
Intersegment Revenue [Member] |  |  |  |  |  |
Summarized information by operating segment [Abstract] |  |  |  |  |  |
Revenues | 131,000 | 388,000 | 277,000 | 1,154,000 |  |
Intersegment Elimination [Member] |  |  |  |  |  |
Summarized information by operating segment [Abstract] |  |  |  |  |  |
Revenues | $ (131,000) | $ (388,000) | $ (277,000) | $ (1,154,000) |  |

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