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8. SUPPLEMENTAL GUARANTOR INFORMATION (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES        
Net income $ 2,761 $ 2,899 $ 1,395 $ 2,747
Depreciation and amortization 14,528 14,893 29,288 29,785
Provision for bad debt     13,777 12,879
Equity in earnings of joint ventures     (2,864) (3,248)
Distributions from joint ventures     3,971 3,375
Deferred rent amortization     1,844 2,582
Amortization of deferred financing cost     1,066 1,205
Amortization of bond discount     1,025 469
(Gain) loss on sale and disposal of equipment     362 300
Gain on sale of imaging centers 2,108 0 2,108 0
Amortization of cash flow hedge     0 551
Stock-based compensation     1,582 1,706
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:        
Accounts receivable     (23,171) (14,097)
Other current assets     (423) (1,887)
Other assets     190 (29)
Deferred taxes     692 0
Deferred revenue     75 (68)
Accounts payable, accrued expenses and other     2,076 4,547
Net cash provided by operating activities     28,777 40,817
CASH FLOWS FROM INVESTING ACTIVITIES        
Purchase of imaging facilities     (3,625) (9,917)
Purchase of property and equipment     (28,349) (25,347)
Proceeds from sale of equipment     505 446
Proceeds from sale of imaging centers     3,920 2,300
Proceeds from sale of joint venture interests     2,640 0
Purchase of equity interest in joint ventures     (1,803) (920)
Net cash used in investing activities     (26,712) (33,438)
CASH FLOWS FROM FINANCING ACTIVITIES        
Principal payments on notes and leases payable     (5,211) (8,016)
Deferred financing costs     432 0
Proceeds from, net of payments, on Term Loan     35,122  
Proceeds from, net of payments on, line of credit     (32,000) 1,500
Payments to counterparties of interest rate swaps, net of amounts received     0 (3,046)
Distributions paid to noncontrolling interests     (7) (64)
Proceeds from issuance of common stock upon exercise of options/warrants     469 0
Net cash used in financing activities     (2,059) (9,626)
EFFECT OF EXCHANGE RATE CHANGES ON CASH     (117) 26
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS     (111) (2,221)
CASH AND CASH EQUIVALENTS, beginning of period     362 2,455
CASH AND CASH EQUIVALENTS, end of period 251 234 251 234
Parent [Member]
        
CASH FLOWS FROM OPERATING ACTIVITIES        
Net income 2,686 2,946 1,344 2,835
Equity in earnings of consolidated subsidiaries     (1,344) (2,835)
Subsidiary Issuer [Member]
        
CASH FLOWS FROM OPERATING ACTIVITIES        
Net income 2,686 2,946 1,344 2,835
Depreciation and amortization 3,152 3,214 6,280 6,361
Provision for bad debt     2,747 2,591
Equity in earnings of consolidated subsidiaries     (2,573) (15,658)
Deferred rent amortization     928 1,388
Amortization of deferred financing cost     1,066 1,205
Amortization of bond discount     1,025 469
(Gain) loss on sale and disposal of equipment     (114) 239
Amortization of cash flow hedge       276
Stock-based compensation     395 426
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:        
Other current assets     (1,720) (460)
Other assets     300 (68)
Accounts payable, accrued expenses and other     (1,763) 17,189
Net cash provided by operating activities     7,915 16,793
CASH FLOWS FROM INVESTING ACTIVITIES        
Purchase of imaging facilities     (350) (8,144)
Purchase of property and equipment     (8,256) (5,544)
Proceeds from sale of equipment     145 43
Net cash used in investing activities     (8,461) (13,645)
CASH FLOWS FROM FINANCING ACTIVITIES        
Principal payments on notes and leases payable     (2,858) (2,968)
Deferred financing costs     (432)  
Proceeds from, net of payments, on Term Loan     35,122  
Proceeds from, net of payments on, line of credit     (32,000) 1,500
Payments to counterparties of interest rate swaps, net of amounts received       (3,046)
Proceeds from issuance of common stock upon exercise of options/warrants     469  
Net cash used in financing activities     301 (4,514)
EFFECT OF EXCHANGE RATE CHANGES ON CASH     (117)  
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS     (362) (1,366)
CASH AND CASH EQUIVALENTS, beginning of period     362 1,366
Guarantor Subsidiaries [Member]
        
CASH FLOWS FROM OPERATING ACTIVITIES        
Net income (3,095) 8,576 2,573 15,658
Depreciation and amortization 10,984 11,617 22,307 23,300
Provision for bad debt     8,499 9,056
Equity in earnings of consolidated subsidiaries     (1,278) (336)
Distributions from consolidated subsidiaries     138 642
Equity in earnings of joint ventures     (2,864) (3,248)
Distributions from joint ventures     3,971 3,375
Deferred rent amortization     858 1,194
(Gain) loss on sale and disposal of equipment     476 61
Gain on sale of imaging centers (2,108)   (2,108)  
Amortization of cash flow hedge       275
Stock-based compensation     1,187 1,280
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:        
Accounts receivable     (6,292) (1,133)
Other current assets     1,269 (1,269)
Other assets     (110) 39
Deferred taxes     692  
Deferred revenue     75 (68)
Accounts payable, accrued expenses and other     (10,161) (23,777)
Net cash provided by operating activities     19,232 25,049
CASH FLOWS FROM INVESTING ACTIVITIES        
Purchase of imaging facilities     (3,275) (1,773)
Purchase of property and equipment     (20,025) (19,803)
Proceeds from sale of equipment     360 403
Proceeds from sale of imaging centers     3,920 2,300
Proceeds from sale of joint venture interests     2,640  
Purchase of equity interest in joint ventures     (1,803) (920)
Net cash used in investing activities     (18,183) (19,793)
CASH FLOWS FROM FINANCING ACTIVITIES        
Principal payments on notes and leases payable     (1,049) (5,048)
Distributions paid to noncontrolling interests       (706)
Net cash used in financing activities     (1,049) (5,048)
EFFECT OF EXCHANGE RATE CHANGES ON CASH       26
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS       234
CASH AND CASH EQUIVALENTS, end of period   234   234
Non-Guarantor Subsidiaries [Member]
        
CASH FLOWS FROM OPERATING ACTIVITIES        
Net income 853 89 1,329 248
Depreciation and amortization 392 62 701 124
Provision for bad debt     2,531 1,232
Deferred rent amortization     58  
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:        
Accounts receivable     (16,879) (12,964)
Other current assets     28 (158)
Accounts payable, accrued expenses and other     14,000 11,135
Net cash provided by operating activities     1,768 (383)
CASH FLOWS FROM INVESTING ACTIVITIES        
Purchase of property and equipment     (68)  
Net cash used in investing activities     (68)  
CASH FLOWS FROM FINANCING ACTIVITIES        
Principal payments on notes and leases payable     (1,304)  
Distributions paid to noncontrolling interests     (145) 642
Net cash used in financing activities     (1,449) (706)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS     251 (1,089)
CASH AND CASH EQUIVALENTS, beginning of period       1,089
CASH AND CASH EQUIVALENTS, end of period 251   251  
Eliminations [Member]
        
CASH FLOWS FROM OPERATING ACTIVITIES        
Net income (369) (11,658) (5,195) (18,829)
Equity in earnings of consolidated subsidiaries     5,195 18,829
Distributions from consolidated subsidiaries     (138) (642)
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:        
Net cash provided by operating activities     (138) (642)
CASH FLOWS FROM FINANCING ACTIVITIES        
Distributions paid to noncontrolling interests     138  
Net cash used in financing activities     $ 138 $ 642