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8. SUPPLEMENTAL GUARANTOR INFORMATION (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES        
Net income $ (367) $ 4,981 $ 1,028 $ 7,728
Depreciation and amortization 14,762 13,369 44,050 43,154
Provision for bad debt     20,810 19,453
Equity in earnings of consolidated subsidiaries          
Distributions from consolidated subsidiaries          
Equity in earnings of joint ventures     (4,481) (4,157)
Distributions from joint ventures     5,624 5,526
Deferred rent amortization     2,893 2,990
Deferred financing cost interest expense       1,803
Amortization of deferred financing cost     1,676 1,803
Amortization of bond discount     (1,651) (706)
(Gain) loss on sale and disposal of equipment     357 255
(Gain) loss on sale of imaging centers     (2,108) 706
Stock-based compensation     2,045 2,139
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:        
Accounts receivable     (25,096) (18,362)
Other current assets     (1,504) (433)
Other assets     172 (51)
Deferred taxes     575  
Deferred revenue     175 72
Accounts payable, accrued expenses and other     (5,357) (3,255)
Net cash provided by operating activities     42,510 55,618
CASH FLOWS FROM INVESTING ACTIVITIES        
Purchase of imaging facilities     (5,918) (10,617)
Purchase of property and equipment     (39,921) (35,279)
Proceeds from sale of equipment     510 841
Proceeds from sale of imaging facilities     3,920 2,300
Proceeds from sale of joint venture interests     2,640 1,800
Purchase of equity interest in joint ventures     (1,803) (2,756)
Net cash used in investing activities     (40,572) (43,711)
CASH FLOWS FROM FINANCING ACTIVITIES        
Principal payments on notes and leases payable     (7,476) (11,180)
Deferred financing costs     (432) 1,800
Proceeds from, net of payments on, line of credit     (29,600) 1,800
Payments to counterparties of interest rate swaps, net of amounts received     0 (4,587)
Distributions to noncontrolling interests     (11) (67)
Proceeds from issuance of common stock upon exercise of options/warrants     469 0
Net cash used in financing activities     (1,928) (14,034)
EFFECT OF EXCHANGE RATE CHANGES ON CASH     (104) 60
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS     (94) (2,067)
CASH AND CASH EQUIVALENTS, beginning of period     362 2,455
CASH AND CASH EQUIVALENTS, end of period 268 388 268 388
Parent [Member]
        
CASH FLOWS FROM OPERATING ACTIVITIES        
Net income (467) 5,053 877 7,888
Depreciation and amortization            
Provision for bad debt          
Equity in earnings of consolidated subsidiaries     (877) (7,888)
Distributions from consolidated subsidiaries          
Equity in earnings of joint ventures          
Distributions from joint ventures          
Deferred rent amortization          
Deferred financing cost interest expense         
Amortization of deferred financing cost         
Amortization of bond discount          
(Gain) loss on sale and disposal of equipment          
(Gain) loss on sale of imaging centers          
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 imaging facilities          
Proceeds from sale of joint venture interests          
Purchase of equity interest in joint ventures          
Net cash used in investing activities          
CASH FLOWS FROM FINANCING ACTIVITIES        
Principal payments on notes and leases payable          
Deferred financing costs          
Proceeds from, net of payments on, line of credit          
Payments to counterparties of interest rate swaps, net of amounts received          
Distributions to noncontrolling interests          
Proceeds from issuance of common stock upon exercise of options/warrants         
Net cash used in financing activities          
EFFECT OF EXCHANGE RATE CHANGES ON CASH          
NET INCREASE (DECREASE) 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 income (467) 5,053 877 7,888
Depreciation and amortization 3,261 3,231 9,541   
Provision for bad debt     4,137   
Equity in earnings of consolidated subsidiaries     (10,975) 32,655
Distributions from consolidated subsidiaries        (845)
Equity in earnings of joint ventures     (20)   
Distributions from joint ventures          
Deferred rent amortization     1,485   
Deferred financing cost interest expense         
Amortization of deferred financing cost     1,676  
Amortization of bond discount     1,651   
(Gain) loss on sale and disposal of equipment     (114)   
(Gain) loss on sale of imaging centers          
Stock-based compensation     511  
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:        
Accounts receivable          
Other current assets     (2,987)   
Other assets     326   
Deferred taxes         
Deferred revenue          
Accounts payable, accrued expenses and other     6,645   
Net cash provided by operating activities     12,753 (845)
CASH FLOWS FROM INVESTING ACTIVITIES        
Purchase of imaging facilities     (350)   
Purchase of property and equipment     (14,466)   
Proceeds from sale of equipment     198   
Proceeds from sale of imaging facilities          
Proceeds from sale of joint venture interests          
Purchase of equity interest in joint ventures          
Net cash used in investing activities     (14,618)   
CASH FLOWS FROM FINANCING ACTIVITIES        
Principal payments on notes and leases payable     (4,056)   
Deferred financing costs     (432)   
Proceeds from, net of payments on, line of credit     35,122   
Payments to counterparties of interest rate swaps, net of amounts received     (29,600)   
Distributions to noncontrolling interests        845
Proceeds from issuance of common stock upon exercise of options/warrants     469  
Net cash used in financing activities     1,503 845
EFFECT OF EXCHANGE RATE CHANGES ON CASH          
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS     (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 income 8,402 8,862 10,975 24,520
Depreciation and amortization 11,108 10,110 33,415 9,592
Provision for bad debt     12,654 4,074
Equity in earnings of consolidated subsidiaries     (2,518) (24,520)
Distributions from consolidated subsidiaries     (9,277)   
Equity in earnings of joint ventures     (4,461)   
Distributions from joint ventures     5,624   
Deferred rent amortization     1,315 1,848
Deferred financing cost interest expense       1,803
Amortization of deferred financing cost         
Amortization of bond discount        1,848
(Gain) loss on sale and disposal of equipment     471 1,803
(Gain) loss on sale of imaging centers     (2,108) 706
Stock-based compensation     1,534  
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:        
Accounts receivable     (2,204)   
Other current assets     1,487 (772)
Other assets     (134) (60)
Deferred taxes     575  
Deferred revenue     175   
Accounts payable, accrued expenses and other     (19,533) 18,667
Net cash provided by operating activities     27,990 20,282
CASH FLOWS FROM INVESTING ACTIVITIES        
Purchase of imaging facilities     (5,568) (8,447)
Purchase of property and equipment     (25,363) (7,558)
Proceeds from sale of equipment     312 43
Proceeds from sale of imaging facilities     3,920   
Proceeds from sale of joint venture interests     2,640   
Purchase of equity interest in joint ventures     (1,803)   
Net cash used in investing activities     (25,862) (15,962)
CASH FLOWS FROM FINANCING ACTIVITIES        
Principal payments on notes and leases payable     (1,756) (4,440)
Deferred financing costs        1,800
Proceeds from, net of payments on, line of credit        1,800
Payments to counterparties of interest rate swaps, net of amounts received        (3,046)
Distributions to noncontrolling interests          
Proceeds from issuance of common stock upon exercise of options/warrants         
Net cash used in financing activities     (1,756) (5,686)
EFFECT OF EXCHANGE RATE CHANGES ON CASH     (104)   
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS     268 (1,366)
CASH AND CASH EQUIVALENTS, beginning of period        1,366
CASH AND CASH EQUIVALENTS, end of period 268    268   
Non-Guarantor Subsidiaries [Member]
        
CASH FLOWS FROM OPERATING ACTIVITIES        
Net income 1,340 (161) 2,669 87
Depreciation and amortization 393 28 1,094 33,410
Provision for bad debt     4,019 13,467
Equity in earnings of consolidated subsidiaries        (247)
Distributions from consolidated subsidiaries        845
Equity in earnings of joint ventures        (4,157)
Distributions from joint ventures        5,526
Deferred rent amortization     93 1,142
Deferred financing cost interest expense         
Amortization of deferred financing cost         
Amortization of bond discount        1,142
(Gain) loss on sale and disposal of equipment          
(Gain) loss on sale of imaging centers          
Stock-based compensation         
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:        
Accounts receivable     (22,892) (5,336)
Other current assets     (4) (32)
Other assets     (20) 9
Deferred taxes         
Deferred revenue        72
Accounts payable, accrued expenses and other     7,531 (32,249)
Net cash provided by operating activities     (7,510) 36,358
CASH FLOWS FROM INVESTING ACTIVITIES        
Purchase of imaging facilities        (2,170)
Purchase of property and equipment     (92) (27,721)
Proceeds from sale of equipment        798
Proceeds from sale of imaging facilities        2,300
Proceeds from sale of joint venture interests        1,800
Purchase of equity interest in joint ventures        (2,756)
Net cash used in investing activities     (92) (27,749)
CASH FLOWS FROM FINANCING ACTIVITIES        
Principal payments on notes and leases payable     (1,664) (6,740)
Deferred financing costs          
Proceeds from, net of payments on, line of credit          
Payments to counterparties of interest rate swaps, net of amounts received        (1,541)
Distributions to noncontrolling interests     9,266   
Proceeds from issuance of common stock upon exercise of options/warrants         
Net cash used in financing activities     7,602 (8,281)
EFFECT OF EXCHANGE RATE CHANGES ON CASH        60
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS        388
CASH AND CASH EQUIVALENTS, beginning of period          
CASH AND CASH EQUIVALENTS, end of period    388    388
Eliminations [Member]
        
CASH FLOWS FROM OPERATING ACTIVITIES        
Net income (9,175) (13,826) (14,370) (32,655)
Depreciation and amortization          152
Provision for bad debt        1,912
Equity in earnings of consolidated subsidiaries     14,370   
Distributions from consolidated subsidiaries     9,277   
Equity in earnings of joint ventures          
Distributions from joint ventures          
Deferred rent amortization          
Deferred financing cost interest expense         
Amortization of deferred financing cost         
Amortization of bond discount          
(Gain) loss on sale and disposal of equipment          
(Gain) loss on sale of imaging centers          
Stock-based compensation         
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:        
Accounts receivable        (13,026)
Other current assets        371
Other assets          
Deferred revenue          
Accounts payable, accrued expenses and other        10,327
Net cash provided by operating activities     9,277 (177)
CASH FLOWS FROM INVESTING ACTIVITIES        
Purchase of imaging facilities          
Purchase of property and equipment          
Proceeds from sale of equipment          
Proceeds from sale of imaging facilities          
Proceeds from sale of joint venture interests          
Purchase of equity interest in joint ventures          
Net cash used in investing activities          
CASH FLOWS FROM FINANCING ACTIVITIES        
Principal payments on notes and leases payable          
Deferred financing costs          
Proceeds from, net of payments on, line of credit          
Payments to counterparties of interest rate swaps, net of amounts received          
Distributions to noncontrolling interests     (9,277) (912)
Proceeds from issuance of common stock upon exercise of options/warrants         
Net cash used in financing activities     (9,277) (912)
EFFECT OF EXCHANGE RATE CHANGES ON CASH          
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS        (1,089)
CASH AND CASH EQUIVALENTS, beginning of period        1,089
CASH AND CASH EQUIVALENTS, end of period