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7. SUPPLEMENTAL GUARANTOR INFORMATION (Details-Cash Flow) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES    
Net (loss) income $ (12,375) $ (1,366)
Depreciation and amortization 15,571 14,760
Provision for bad debt 6,893 6,822
Equity in earnings of consolidated subsidiaries      
Distributions from consolidated subsidiaries      
Equity in earnings of joint ventures (1,067) (1,206)
Distributions from joint ventures 1,866 1,921
Deferred rent amortization 343 433
Amortization of deferred financing cost 552 457
Write off of deferred loan costs due to refinance 665 0
Amortization of term loan and bond discount 616 400
Loss on sale and disposal of equipment 246 170
Loss on early extinguishment of Senior Notes 15,456  
Stock-based compensation 1,025 952
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:    
Accounts receivable (13,923) (11,782)
Other current assets (4,503) (5,099)
Other assets (575) (105)
Deferred taxes (4,536)  
Deferred revenue (39) 3
Accounts payable, accrued expenses and other (11,075) 8,861
Net cash provided by operating activities (4,860) 15,221
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchase of imaging facilities (360) (3,625)
Purchase of property and equipment (17,047) (12,926)
Proceeds from sale of equipment 4 270
Proceeds from sale of joint venture interests 0 2,640
Equity contributions in existing joint ventures (789) (724)
Net cash used in investing activities (18,192) (14,365)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes and leases payable (1,929) (2,697)
Proceeds from borrowings upon refinancing 210,000 0
Payments on Senior Notes (204,468) 0
Deferred financing costs (6,650)   
Proceeds from, net of payments on, line of credit 18,100 1,500
Distributions to noncontrolling interests (133)  
Purchase of non-controlling interests     
Proceeds from issuance of common stock upon exercise of options/warrants 29 469
Net cash used in financing activities 14,949 (728)
EFFECT OF EXCHANGE RATE CHANGES ON CASH (18) (59)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (8,121) 69
CASH AND CASH EQUIVALENTS, beginning of period 8,412 362
CASH AND CASH EQUIVALENTS, end of period 291 431
Parent [Member]
    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net (loss) income (12,424) (1,342)
Depreciation and amortization      
Provision for bad debt      
Equity in earnings of consolidated subsidiaries 12,424 1,342
Distributions from consolidated subsidiaries      
Equity in earnings of joint ventures      
Distributions from joint ventures      
Deferred rent amortization      
Amortization of deferred financing cost      
Write off of deferred loan costs due to refinance     
Amortization of term loan and bond discount      
Loss on sale and disposal of equipment      
Loss on early extinguishment of Senior Notes     
Stock-based compensation      
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:    
Accounts receivable      
Other current assets      
Other assets      
Deferred taxes     
Deferred revenue      
Accounts payable, accrued expenses and other      
Net cash provided by operating activities      
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchase of imaging facilities      
Purchase of property and equipment      
Proceeds from sale of equipment      
Proceeds from sale of joint venture interests      
Equity contributions in existing joint ventures      
Net cash used in investing activities      
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes and leases payable      
Proceeds from borrowings upon refinancing     
Payments on Senior Notes     
Deferred financing costs      
Proceeds from, net of payments on, line of credit      
Distributions to noncontrolling interests     
Purchase of non-controlling interests     
Proceeds from issuance of common stock upon exercise of options/warrants      
Net cash used in financing activities      
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS      
CASH AND CASH EQUIVALENTS, beginning of period      
CASH AND CASH EQUIVALENTS, end of period      
Subsidiary Issuer [Member]
    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net (loss) income (12,424) (1,342)
Depreciation and amortization 3,556 3,128
Provision for bad debt 1,428 1,385
Equity in earnings of consolidated subsidiaries (5,540) (5,668)
Distributions from consolidated subsidiaries      
Equity in earnings of joint ventures (53)   
Distributions from joint ventures      
Deferred rent amortization (18) 156
Amortization of deferred financing cost 552 457
Write off of deferred loan costs due to refinance 665  
Amortization of term loan and bond discount 616 400
Loss on sale and disposal of equipment 15 85
Loss on early extinguishment of Senior Notes 15,456  
Stock-based compensation 256 238
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:    
Accounts receivable      
Other current assets 4,401 (3,611)
Other assets (64) 225
Deferred taxes     
Deferred revenue      
Accounts payable, accrued expenses and other (38,301) 7,957
Net cash provided by operating activities (29,455) 3,410
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchase of imaging facilities    (350)
Purchase of property and equipment (435) (4,053)
Proceeds from sale of equipment    145
Proceeds from sale of joint venture interests      
Equity contributions in existing joint ventures      
Net cash used in investing activities (435) (4,258)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes and leases payable 11,740 (1,424)
Proceeds from borrowings upon refinancing 210,000  
Payments on Senior Notes (204,468)  
Deferred financing costs (6,650)   
Proceeds from, net of payments on, line of credit 18,100 1,500
Distributions to noncontrolling interests     
Purchase of non-controlling interests     
Proceeds from issuance of common stock upon exercise of options/warrants 29 469
Net cash used in financing activities 28,751 545
EFFECT OF EXCHANGE RATE CHANGES ON CASH    (59)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (1,139) (362)
CASH AND CASH EQUIVALENTS, beginning of period    362
CASH AND CASH EQUIVALENTS, end of period      
Guarantor Subsidiaries [Member]
    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net (loss) income 5,540 5,668
Depreciation and amortization 11,582 11,323
Provision for bad debt 4,061 4,217
Equity in earnings of consolidated subsidiaries (813) (500)
Distributions from consolidated subsidiaries 1,128   
Equity in earnings of joint ventures (1,014) (1,206)
Distributions from joint ventures 1,866 1,921
Deferred rent amortization 316 254
Amortization of deferred financing cost      
Write off of deferred loan costs due to refinance     
Amortization of term loan and bond discount      
Loss on sale and disposal of equipment 231 85
Loss on early extinguishment of Senior Notes     
Stock-based compensation 769 714
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:    
Accounts receivable (29,822) 1,214
Other current assets (9,056) (1,606)
Other assets (511) (330)
Deferred taxes (4,536)  
Deferred revenue (39) 3
Accounts payable, accrued expenses and other 43,882 (10,285)
Net cash provided by operating activities 23,584 11,472
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchase of imaging facilities (360) (3,275)
Purchase of property and equipment (16,154) (8,847)
Proceeds from sale of equipment 4 125
Proceeds from sale of joint venture interests    2,640
Equity contributions in existing joint ventures (789) (724)
Net cash used in investing activities (17,299) (10,081)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes and leases payable (13,249) (960)
Proceeds from borrowings upon refinancing     
Payments on Senior Notes     
Deferred financing costs      
Proceeds from, net of payments on, line of credit      
Distributions to noncontrolling interests     
Purchase of non-controlling interests     
Proceeds from issuance of common stock upon exercise of options/warrants      
Net cash used in financing activities (13,249) (960)
EFFECT OF EXCHANGE RATE CHANGES ON CASH (18)   
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (6,982) 431
CASH AND CASH EQUIVALENTS, beginning of period 8,412   
CASH AND CASH EQUIVALENTS, end of period 291 431
Non-Guarantor Subsidiaries [Member]
    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net (loss) income 862 476
Depreciation and amortization 433 309
Provision for bad debt 1,404 1,220
Equity in earnings of consolidated subsidiaries      
Distributions from consolidated subsidiaries      
Equity in earnings of joint ventures      
Distributions from joint ventures      
Deferred rent amortization 45 23
Amortization of deferred financing cost      
Write off of deferred loan costs due to refinance     
Amortization of term loan and bond discount      
Loss on sale and disposal of equipment      
Loss on early extinguishment of Senior Notes     
Stock-based compensation      
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:    
Accounts receivable 15,899 (12,996)
Other current assets 152 118
Other assets      
Deferred taxes     
Deferred revenue      
Accounts payable, accrued expenses and other (16,656) 11,189
Net cash provided by operating activities 2,139 339
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchase of imaging facilities      
Purchase of property and equipment (458) (26)
Proceeds from sale of equipment      
Proceeds from sale of joint venture interests      
Equity contributions in existing joint ventures      
Net cash used in investing activities (458) (26)
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes and leases payable (420) (313)
Proceeds from borrowings upon refinancing     
Payments on Senior Notes     
Deferred financing costs      
Proceeds from, net of payments on, line of credit      
Distributions to noncontrolling interests (1,261)  
Purchase of non-controlling interests     
Proceeds from issuance of common stock upon exercise of options/warrants      
Net cash used in financing activities (1,681) (313)
EFFECT OF EXCHANGE RATE CHANGES ON CASH     
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS      
CASH AND CASH EQUIVALENTS, beginning of period      
CASH AND CASH EQUIVALENTS, end of period      
Eliminations [Member]
    
CASH FLOWS FROM OPERATING ACTIVITIES    
Net (loss) income 6,071 (4,826)
Depreciation and amortization      
Provision for bad debt      
Equity in earnings of consolidated subsidiaries (6,071) 4,826
Distributions from consolidated subsidiaries (1,128)   
Equity in earnings of joint ventures      
Distributions from joint ventures      
Deferred rent amortization      
Amortization of deferred financing cost      
Write off of deferred loan costs due to refinance     
Amortization of term loan and bond discount      
Loss on sale and disposal of equipment      
Loss on early extinguishment of Senior Notes     
Stock-based compensation      
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:    
Accounts receivable      
Other current assets      
Other assets      
Deferred taxes     
Deferred revenue      
Accounts payable, accrued expenses and other      
Net cash provided by operating activities (1,128)   
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchase of imaging facilities      
Purchase of property and equipment      
Proceeds from sale of equipment      
Proceeds from sale of joint venture interests      
Equity contributions in existing joint ventures      
Net cash used in investing activities      
CASH FLOWS FROM FINANCING ACTIVITIES    
Principal payments on notes and leases payable      
Proceeds from borrowings upon refinancing     
Payments on Senior Notes     
Deferred financing costs      
Proceeds from, net of payments on, line of credit      
Distributions to noncontrolling interests 1,128  
Purchase of non-controlling interests     
Proceeds from issuance of common stock upon exercise of options/warrants      
Net cash used in financing activities 1,128   
EFFECT OF EXCHANGE RATE CHANGES ON CASH     
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS      
CASH AND CASH EQUIVALENTS, beginning of period      
CASH AND CASH EQUIVALENTS, end of period