Quarterly report pursuant to Section 13 or 15(d)

Schedule of intangible assets (Detail)

v3.8.0.1
Schedule of intangible assets (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Finite-Lived Intangible Assets [Line Items]        
Accumulated Amortization $ (45,337,343) $ (40,942,442)    
Intangible Assets, Net 99,138,657 103,533,558    
Intangible Assets, Gross, Total, Ending Balance 144,476,000      
Finite-Lived Intangible Assets [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible Assets, Gross, Total, Beginning Balance   144,476,000    
Intangible Assets, Net   103,533,558    
Intangible Assets, Gross, Total, Ending Balance     $ 144,476,000  
Medicare License | Indefinite-lived Intangible Assets [Member]        
Finite-Lived Intangible Assets [Line Items]        
Accumulated Amortization 0 0    
Intangible Assets, Net 1,994,000 1,994,000    
Indefinite Lived Assets, Gross, Beginning Balance   $ 1,994,000    
Intangible Assets, Gross, Total, Ending Balance $ 1,994,000      
Network relationships | Maximum [Member]        
Finite-Lived Intangible Assets [Line Items]        
Weighted Average Life (Yrs) 15 years 15 years    
Network relationships | Minimum [Member]        
Finite-Lived Intangible Assets [Line Items]        
Weighted Average Life (Yrs) 11 years 11 years    
Network relationships | Finite-Lived Intangible Assets [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible Assets, Gross, Total, Beginning Balance   $ 109,883,000    
Accumulated Amortization $ (39,179,025)     $ (35,842,508)
Intangible Assets, Net 70,703,975 $ 74,040,492    
Intangible Assets, Gross, Total, Ending Balance $ 109,883,000   109,883,000  
Trade name        
Finite-Lived Intangible Assets [Line Items]        
Weighted Average Life (Yrs) 20 years 20 years    
Accumulated Amortization   $ (4,212)    
Trade name | Finite-Lived Intangible Assets [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible Assets, Gross, Total, Beginning Balance   1,011,000    
Accumulated Amortization $ (16,850)      
Intangible Assets, Net 994,150 1,006,788    
Intangible Assets, Gross, Total, Ending Balance $ 1,011,000   $ 1,011,000  
Management contracts [Member]        
Finite-Lived Intangible Assets [Line Items]        
Weighted Average Life (Yrs) 15 years   15 years  
Management contracts [Member] | Finite-Lived Intangible Assets [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible Assets, Gross, Total, Beginning Balance   22,832,000    
Accumulated Amortization $ (5,646,843) (5,014,886)    
Intangible Assets, Net 17,185,157 $ 17,817,114    
Intangible Assets, Gross, Total, Ending Balance $ 22,832,000   $ 22,832,000  
Member relationships [Member]        
Finite-Lived Intangible Assets [Line Items]        
Weighted Average Life (Yrs) 12 years 12 years    
Member relationships [Member] | Finite-Lived Intangible Assets [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible Assets, Gross, Total, Beginning Balance   $ 6,696,000    
Accumulated Amortization $ (357,292) (46,500)    
Intangible Assets, Net 6,338,708 $ 6,649,500    
Intangible Assets, Gross, Total, Ending Balance $ 6,696,000   6,696,000  
Patient management platform [Member]        
Finite-Lived Intangible Assets [Line Items]        
Weighted Average Life (Yrs) 5 years 5 years    
Accumulated Amortization   $ (34,336)    
Patient management platform [Member] | Finite-Lived Intangible Assets [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible Assets, Gross, Total, Beginning Balance   2,060,000    
Accumulated Amortization $ (137,333)      
Intangible Assets, Net 1,922,667 $ 2,025,664    
Intangible Assets, Gross, Total, Ending Balance $ 2,060,000   $ 2,060,000