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14. SUPPLEMENTAL GUARANTOR INFORMATION (Details-Statements of Cash Flows) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 2,376 $ 59,604 $ 7,342
Depreciation and amortization 58,890 57,740 57,481
Provision for bad debt 27,911 25,904 22,339
Equity in earnings of consolidated subsidiaries 0 0 0
Distributions from consolidated subsidiaries 0 0 0
Equity in earnings of joint ventures (6,194) (6,476) (5,224)
Distributions from joint ventures 7,204 6,477 4,993
Deferred rent amortization 3,871 3,608 2,282
Amortization of deferred financing cost 2,286 2,474 2,940
Amortization of bond discount 2,279 1,163 244
(Gain) loss on sale and disposal of equipment 1,032 456 (2,240)
Gain on de-consolidation of joint venture 0 (2,777) 0
Amortization of cash flow hedge 0 918 1,225
Gain on bargain purchase 0 (810) 0
(Gain) loss on sale of imaging centers (2,108)    
Stock-based compensation 2,574 2,736 3,110
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:      
Accounts receivable (31,531) (17,350) (45,014)
Other current assets (2,243) 3,565 (3,935)
Other assets 260 (578) 43
Deferred taxes 2,907 (56,142)  
Deferred revenue 71 197 (492)
Accounts payable, accrued expenses and other (3,163) (5,440) 12,542
Net cash provided by operating activities 66,422 75,269 57,636
CASH FLOWS FROM INVESTING ACTIVITIES      
Purchase of imaging facilities (7,223) (45,493) (42,990)
Proceeds from insurance clains on damaged equipment 0 0 2,740
Purchase of property and equipment (48,623) (44,448) (42,720)
Proceeds from sale of equipment 635 1,549 325
Proceeds from sale of imaging facilities 3,920 2,300 0
Proceeds from sale of joint venture interests 2,640 1,800  
Purchase of equity interest in joint ventures (2,009) (2,756) (5,094)
Net cash used in investing activities (50,660) (87,048) (87,739)
CASH FLOWS FROM FINANCING ACTIVITIES      
Principal payments on notes and leases payable (9,764) (22,223) (18,756)
Repayment of debt upon extinguishment 0 (277,875) 0
Proceeds from borrowings upon refinancing 35,122 344,485 0
Deferred financing costs (432) (3,753) (944)
Proceeds from, net of payments on, line of credit (33,000) (25,000) 58,000
Payments to counterparties of interest rate swaps, net of amounts received 0 (5,823) (6,455)
Distributions to noncontrolling interests (18) (71) (154)
Proceeds from issuance of common stock upon exercise of options/warrants 469 0 242
Purchase of non-controlling interests 0 (117) 0
Net cash used in financing activities (7,623) 9,623 31,933
EFFECT OF EXCHANGE RATE CHANGES ON CASH (89) 63 (2)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 8,050 (2,093) 1,828
CASH AND CASH EQUIVALENTS, beginning of period 362 2,455 627
CASH AND CASH EQUIVALENTS, end of period 8,412 362 2,455
Parent [Member]
      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income 2,120 59,834 7,231
Depreciation and amortization 0 0 0
Provision for bad debt 0 0 0
Equity in earnings of consolidated subsidiaries (2,120) (59,834) (7,231)
Distributions from consolidated subsidiaries 0 0 0
Equity in earnings of joint ventures 0 0 0
Distributions from joint ventures 0 0 0
Deferred rent amortization 0 0 0
Amortization of deferred financing cost 0 0 0
Amortization of bond discount 0 0 0
(Gain) loss on sale and disposal of equipment 0 0 0
Gain on de-consolidation of joint venture   0  
Amortization of cash flow hedge   0 0
Gain on bargain purchase   0  
(Gain) loss on sale of imaging centers 0    
Stock-based compensation 0 0 0
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:      
Accounts receivable 0 0 0
Other current assets 0 0 0
Other assets 0 0 0
Deferred taxes 0 0  
Deferred revenue 0 0 0
Accounts payable, accrued expenses and other 0 0 0
Net cash provided by operating activities 0 0 0
CASH FLOWS FROM INVESTING ACTIVITIES      
Purchase of imaging facilities 0 0 0
Proceeds from insurance clains on damaged equipment     0
Purchase of property and equipment 0 0 0
Proceeds from sale of equipment 0 0 0
Proceeds from sale of imaging facilities 0 0  
Proceeds from sale of joint venture interests 0 0  
Purchase of equity interest in joint ventures 0 0 0
Net cash used in investing activities 0 0 0
CASH FLOWS FROM FINANCING ACTIVITIES      
Principal payments on notes and leases payable 0 0 0
Repayment of debt upon extinguishment   0  
Proceeds from borrowings upon refinancing 0 0  
Deferred financing costs 0 0 0
Proceeds from, net of payments on, line of credit 0 0 0
Payments to counterparties of interest rate swaps, net of amounts received 0 0 0
Distributions to noncontrolling interests 0 0 0
Proceeds from issuance of common stock upon exercise of options/warrants 0   0
Purchase of non-controlling interests   0  
Net cash used in financing activities 0 0 0
EFFECT OF EXCHANGE RATE CHANGES ON CASH 0 0 0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 0 0 0
CASH AND CASH EQUIVALENTS, beginning of period 0 0 0
CASH AND CASH EQUIVALENTS, end of period 0 0 0
Subsidiary Issuer [Member]
      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income 2,120 59,834 7,231
Depreciation and amortization 12,831 12,690 13,986
Provision for bad debt 5,557 5,452 4,485
Equity in earnings of consolidated subsidiaries (15,438) (88,397) (31,410)
Distributions from consolidated subsidiaries 0 0 0
Equity in earnings of joint ventures 0 0 0
Distributions from joint ventures 0 0 0
Deferred rent amortization 2,074 1,917 1,811
Amortization of deferred financing cost 1,676 2,474 2,940
Amortization of bond discount 1,651 1,163 244
(Gain) loss on sale and disposal of equipment (315) 600 (2,512)
Gain on de-consolidation of joint venture   0  
Amortization of cash flow hedge   918 1,225
Gain on bargain purchase   0  
(Gain) loss on sale of imaging centers 0    
Stock-based compensation 643 684 778
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:      
Accounts receivable 0 0 0
Other current assets (2,957) 2,203 (3,366)
Other assets 335 (542) 41
Deferred taxes 0 0  
Deferred revenue 0 0 0
Accounts payable, accrued expenses and other 13,074 (6,524) (27,252)
Net cash provided by operating activities 21,251 (7,528) (31,799)
CASH FLOWS FROM INVESTING ACTIVITIES      
Purchase of imaging facilities (655) (10,494) (1,999)
Proceeds from insurance clains on damaged equipment     2,422
Purchase of property and equipment (17,619) (9,173) (11,125)
Proceeds from sale of equipment 249 218 0
Proceeds from sale of imaging facilities 0 0  
Proceeds from sale of joint venture interests 0 0  
Purchase of equity interest in joint ventures 0 0 0
Net cash used in investing activities (18,025) (19,449) (10,702)
CASH FLOWS FROM FINANCING ACTIVITIES      
Principal payments on notes and leases payable (4,608) (6,061) (7,181)
Repayment of debt upon extinguishment   (277,875)  
Proceeds from borrowings upon refinancing 35,122 344,485  
Deferred financing costs (432) (3,753) (944)
Proceeds from, net of payments on, line of credit (33,000) (25,000) 58,000
Payments to counterparties of interest rate swaps, net of amounts received 0 (5,823) (6,455)
Distributions to noncontrolling interests 0 0 0
Proceeds from issuance of common stock upon exercise of options/warrants 469   242
Purchase of non-controlling interests   0  
Net cash used in financing activities (2,449) 25,973 43,662
EFFECT OF EXCHANGE RATE CHANGES ON CASH 0 0 0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 777 (1,004) 1,161
CASH AND CASH EQUIVALENTS, beginning of period 362 1,366 205
CASH AND CASH EQUIVALENTS, end of period 0 362 1,366
Guarantor Subsidiaries [Member]
      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income 15,438 88,397 31,410
Depreciation and amortization 44,543 44,870 43,268
Provision for bad debt 16,873 17,888 15,443
Equity in earnings of consolidated subsidiaries (3,707) (151) (1,275)
Distributions from consolidated subsidiaries 340 906 1,597
Equity in earnings of joint ventures (6,194) (6,476) (5,224)
Distributions from joint ventures 7,204 6,477 4,993
Deferred rent amortization 1,592 1,691 471
Amortization of deferred financing cost 610 0 0
Amortization of bond discount 628 0 0
(Gain) loss on sale and disposal of equipment 1,347 (144) 272
Gain on de-consolidation of joint venture   (2,777)  
Amortization of cash flow hedge   0 0
Gain on bargain purchase   (810)  
(Gain) loss on sale of imaging centers (2,108)    
Stock-based compensation 1,931 2,052 2,332
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:      
Accounts receivable (4,269) (4,051) (27,886)
Other current assets 516 1,085 (183)
Other assets (55) (36) 2
Deferred taxes 2,907 (56,142)  
Deferred revenue 71 197 (492)
Accounts payable, accrued expenses and other (35,835) (9,161) 23,275
Net cash provided by operating activities 41,832 83,815 88,003
CASH FLOWS FROM INVESTING ACTIVITIES      
Purchase of imaging facilities (6,568) (34,999) (40,991)
Proceeds from insurance clains on damaged equipment     318
Purchase of property and equipment (29,768) (35,275) (30,984)
Proceeds from sale of equipment 386 1,331 325
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 (2,009) (2,756) (5,094)
Net cash used in investing activities (31,399) (67,599) (76,426)
CASH FLOWS FROM FINANCING ACTIVITIES      
Principal payments on notes and leases payable (3,071) (16,162) (11,575)
Repayment of debt upon extinguishment   0  
Proceeds from borrowings upon refinancing 0 0  
Deferred financing costs 0 0 0
Proceeds from, net of payments on, line of credit 0 0 0
Payments to counterparties of interest rate swaps, net of amounts received 0 0 0
Distributions to noncontrolling interests 0 0 0
Proceeds from issuance of common stock upon exercise of options/warrants 0   0
Purchase of non-controlling interests   (117)  
Net cash used in financing activities (3,071) (16,279) (11,575)
EFFECT OF EXCHANGE RATE CHANGES ON CASH (89) 63 (2)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 7,273 0 0
CASH AND CASH EQUIVALENTS, beginning of period 0 0 0
CASH AND CASH EQUIVALENTS, end of period 8,412 0 0
Non-Guarantor Subsidiaries [Member]
      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income 3,963 (79) 1,386
Depreciation and amortization 1,516 180 227
Provision for bad debt 5,481 2,564 2,411
Equity in earnings of consolidated subsidiaries 0 0 0
Distributions from consolidated subsidiaries 0 0 0
Equity in earnings of joint ventures 0 0 0
Distributions from joint ventures 0 0 0
Deferred rent amortization 205 0 0
Amortization of deferred financing cost 0 0 0
Amortization of bond discount 0 0 0
(Gain) loss on sale and disposal of equipment 0 0 0
Gain on de-consolidation of joint venture   0  
Amortization of cash flow hedge   0 0
Gain on bargain purchase   0  
(Gain) loss on sale of imaging centers 0    
Stock-based compensation 0 0 0
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:      
Accounts receivable (27,262) (13,299) (17,128)
Other current assets 198 277 (386)
Other assets (20) 0 0
Deferred taxes 0 0  
Deferred revenue 0 0 0
Accounts payable, accrued expenses and other 19,598 10,245 16,519
Net cash provided by operating activities 3,679 (112) 3,029
CASH FLOWS FROM INVESTING ACTIVITIES      
Purchase of imaging facilities 0 0 0
Proceeds from insurance clains on damaged equipment     0
Purchase of property and equipment (1,236) 0 (611)
Proceeds from sale of equipment 0 0 0
Proceeds from sale of imaging facilities 0 0  
Proceeds from sale of joint venture interests 0 0  
Purchase of equity interest in joint ventures 0 0 0
Net cash used in investing activities (1,236) 0 (611)
CASH FLOWS FROM FINANCING ACTIVITIES      
Principal payments on notes and leases payable (2,085) 0 0
Repayment of debt upon extinguishment   0  
Proceeds from borrowings upon refinancing 0 0  
Deferred financing costs 0 0 0
Proceeds from, net of payments on, line of credit 0 0 0
Payments to counterparties of interest rate swaps, net of amounts received 0 0 0
Distributions to noncontrolling interests (358) (977) (1,751)
Proceeds from issuance of common stock upon exercise of options/warrants 0   0
Purchase of non-controlling interests   0  
Net cash used in financing activities (2,443) (977) (1,751)
EFFECT OF EXCHANGE RATE CHANGES ON CASH 0 0 0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 0 (1,089) 667
CASH AND CASH EQUIVALENTS, beginning of period 0 1,089 422
CASH AND CASH EQUIVALENTS, end of period 0 0 1,089
Eliminations [Member]
      
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income (21,265) (148,382) (39,916)
Depreciation and amortization 0 0 0
Provision for bad debt 0 0 0
Equity in earnings of consolidated subsidiaries 21,265 148,382 39,916
Distributions from consolidated subsidiaries (340) (906) (1,597)
Equity in earnings of joint ventures 0 0 0
Distributions from joint ventures 0 0 0
Deferred rent amortization 0 0 0
Amortization of deferred financing cost 0 0 0
Amortization of bond discount 0 0 0
(Gain) loss on sale and disposal of equipment 0 0 0
Gain on de-consolidation of joint venture   0  
Amortization of cash flow hedge   0 0
Gain on bargain purchase   0  
(Gain) loss on sale of imaging centers 0    
Stock-based compensation 0 0 0
Changes in operating assets and liabilities, net of assets acquired and liabilities assumed in purchase transactions:      
Accounts receivable 0 0 0
Other current assets 0 0 0
Other assets 0 0 0
Deferred taxes 0 0  
Deferred revenue 0 0 0
Accounts payable, accrued expenses and other 0 0 0
Net cash provided by operating activities (340) (906) (1,597)
CASH FLOWS FROM INVESTING ACTIVITIES      
Purchase of imaging facilities 0 0 0
Proceeds from insurance clains on damaged equipment     0
Purchase of property and equipment 0 0 0
Proceeds from sale of equipment 0 0 0
Proceeds from sale of imaging facilities 0 0  
Proceeds from sale of joint venture interests 0 0  
Purchase of equity interest in joint ventures 0 0 0
Net cash used in investing activities 0 0 0
CASH FLOWS FROM FINANCING ACTIVITIES      
Principal payments on notes and leases payable 0 0 0
Repayment of debt upon extinguishment   0  
Proceeds from borrowings upon refinancing 0 0  
Deferred financing costs 0 0 0
Proceeds from, net of payments on, line of credit 0 0 0
Payments to counterparties of interest rate swaps, net of amounts received 0 0 0
Distributions to noncontrolling interests 340 906 1,597
Proceeds from issuance of common stock upon exercise of options/warrants 0   0
Purchase of non-controlling interests   0  
Net cash used in financing activities 340 906 1,597
EFFECT OF EXCHANGE RATE CHANGES ON CASH 0 0 0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 0 0 0
CASH AND CASH EQUIVALENTS, beginning of period 0 0 0
CASH AND CASH EQUIVALENTS, end of period $ 0 $ 0 $ 0