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8. SUPPLEMENTAL GUARANTOR INFORMATION (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES    
Net (loss) income $ (1,366) $ (152)
Depreciation and amortization 14,760 14,892
Provision for bad debt 6,822 6,484
Equity in earnings of joint ventures (1,206) (1,262)
Distributions from joint ventures 1,921 1,575
Deferred rent amortization 433 288
Amortization of deferred financing cost 457 602
Amortization of bond discount 400 234
Loss on sale and disposal of equipment 170 24
Amortization of cash flow hedge    276
Stock-based compensation 952 1,175
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:    
Accounts receivable (11,782) (12,023)
Other current assets (5,099) (683)
Other assets (105) (64)
Deferred revenue 3 86
Accounts payable, accrued expenses and other 8,861 3,979
Net cash provided by operating activities 15,221 15,431
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchase of imaging facilities (3,625) (580)
Purchase of property and equipment (12,926) (13,962)
Proceeds from sale of equipment 270 410
Proceeds from sale of noncontrolling interests 2,640   
Proceeds from sale of imaging facilities    2,300
Purchase of equity interest in joint ventures (724) (920)
Net cash used in investing activities (14,365) (12,752)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes and leases payable (2,697) (4,479)
Proceeds from, net of payments on, line of credit 1,500 2,700
Payments to counterparties of interest rate swaps, net of amounts received    (1,500)
Distributions to noncontrolling interests    (26)
Proceeds from issuance of common stock upon exercise of options/warrants 469   
Net cash used in financing activities (728) (3,305)
EFFECT OF EXCHANGE RATE CHANGES ON CASH (59) 5
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 69 (621)
CASH AND CASH EQUIVALENTS, beginning of period 362 2,455
CASH AND CASH EQUIVALENTS, end of period 431 1,834
Parent [Member]
    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net (loss) income (1,342) (111)
Equity in earnings of consolidated subsidiaries 1,342 111
Subsidiary Issuer [Member]
    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net (loss) income (1,342) (111)
Depreciation and amortization 3,128 3,147
Provision for bad debt 1,385 1,267
Equity in earnings of consolidated subsidiaries (5,668) (7,082)
Deferred rent amortization 156 36
Amortization of deferred financing cost 457 602
Amortization of bond discount 400 234
Loss on sale and disposal of equipment 85 137
Amortization of cash flow hedge   276
Stock-based compensation 238 294
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:    
Other current assets (3,611) 1,286
Other assets 225 (19)
Accounts payable, accrued expenses and other 7,957 3,175
Net cash provided by operating activities 3,410 3,242
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchase of imaging facilities (350)  
Purchase of property and equipment (4,053) (4,445)
Proceeds from sale of equipment 145 43
Net cash used in investing activities (4,258) (4,402)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes and leases payable (1,424) (1,406)
Proceeds from, net of payments on, line of credit 1,500 2,700
Payments to counterparties of interest rate swaps, net of amounts received   (1,500)
Proceeds from issuance of common stock upon exercise of options/warrants 469  
Net cash used in financing activities 545 (206)
EFFECT OF EXCHANGE RATE CHANGES ON CASH (59) 5
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 (loss) income 5,668 7,082
Depreciation and amortization 11,323 11,683
Provision for bad debt 4,217 4,598
Equity in earnings of consolidated subsidiaries (500) (200)
Distributions from consolidated subsidiaries   276
Equity in earnings of joint ventures (1,206) (1,262)
Distributions from joint ventures 1,921 1,575
Deferred rent amortization 254 252
Loss on sale and disposal of equipment 85 (113)
Stock-based compensation 714 881
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:    
Accounts receivable 1,214 (3,018)
Other current assets (1,606) (1,472)
Other assets (330) (45)
Deferred revenue 3 86
Accounts payable, accrued expenses and other (10,285) (8,028)
Net cash provided by operating activities 11,472 12,299
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchase of imaging facilities (3,275) (580)
Purchase of property and equipment (8,847) (9,517)
Proceeds from sale of equipment 125 367
Proceeds from sale of noncontrolling interests 2,640  
Proceeds from sale of imaging facilities   2,300
Purchase of equity interest in joint ventures (724) (920)
Net cash used in investing activities (10,081) (8,350)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes and leases payable (960) (3,073)
Distributions to noncontrolling interests   (302)
Net cash used in financing activities (960) (3,073)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 431 881
CASH AND CASH EQUIVALENTS, end of period 431 881
Non-Guarantor Subsidiaries [Member]
    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net (loss) income 476 159
Depreciation and amortization 309 62
Provision for bad debt 1,220 519
Deferred rent amortization 23  
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:    
Accounts receivable (12,996) (9,009)
Other current assets 118 (497)
Accounts payable, accrued expenses and other 11,189 8,832
Net cash provided by operating activities 339 166
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchase of property and equipment (26)  
Net cash used in investing activities (26)  
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes and leases payable (313)  
Distributions to noncontrolling interests   276
Net cash used in financing activities (313) (302)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS   (136)
CASH AND CASH EQUIVALENTS, beginning of period   1,089
CASH AND CASH EQUIVALENTS, end of period   953
Eliminations [Member]
    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net (loss) income (4,826) (7,171)
Equity in earnings of consolidated subsidiaries 4,826 7,171
Distributions from consolidated subsidiaries   (276)
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:    
Net cash provided by operating activities   (276)
CASH FLOWS FROM FINANCING ACTIVITIES    
Net cash used in financing activities   $ 276