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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 |

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