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Schedule of intangible assets (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Gross, Total, Beginning Balance | $ 132,727,000 | $ 129,492,000 |
Finite-lived Intangible Assets, Impairment/Disposal | (3,235,000) | 0 |
Accumulated Amortization | (40,942,442) | (24,632,951) |
Intangible Assets, Net | 103,533,558 | 108,094,049 |
Finite-lived Intangible Assets, Additions | 14,984,000 | 3,235,000 |
Intangible Assets, Gross, Total, Ending Balance | 144,476,000 | 132,727,000 |
Medicare License | Indefinite-lived Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Gross, Total, Beginning Balance | 0 |  |
Finite-lived Intangible Assets, Impairment/Disposal | 0 |  |
Accumulated Amortization | 0 |  |
Intangible Assets, Net | 1,994,000 |  |
Finite-lived Intangible Assets, Additions | 1,994,000 |  |
Intangible Assets, Gross, Total, Ending Balance | $ 1,994,000 | $ 0 |
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 | $ 106,660,000 | $ 106,660,000 |
Finite-lived Intangible Assets, Impairment/Disposal | 0 | 0 |
Accumulated Amortization | (35,842,508) |  | $ (22,186,665)
Intangible Assets, Net | 74,040,492 | 84,473,335 |
Finite-lived Intangible Assets, Additions | 3,223,000 | 0 |
Intangible Assets, Gross, Total, Ending Balance | $ 109,883,000 | 106,660,000 |
Trade name |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Life (Yrs) | 20 years |  |
Trade name | Finite-Lived Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Gross, Total, Beginning Balance | $ 0 |  |
Finite-lived Intangible Assets, Impairment/Disposal | 0 |  |
Accumulated Amortization | (4,212) |  |
Intangible Assets, Net | 1,006,788 |  |
Finite-lived Intangible Assets, Additions | 1,011,000 |  |
Intangible Assets, Gross, Total, Ending Balance | $ 1,011,000 | $ 0 |
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 | $ 22,832,000 |
Finite-lived Intangible Assets, Impairment/Disposal | 0 | 0 |
Accumulated Amortization | (5,014,886) | (2,446,286) |
Intangible Assets, Net | 17,817,114 | 20,385,714 |
Finite-lived Intangible Assets, Additions | 0 | 0 |
Intangible Assets, Gross, Total, Ending Balance | $ 22,832,000 | $ 22,832,000 |
Member relationships [Member] | Maximum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Life (Yrs) | 12 years | 7 years |
Member relationships [Member] | Minimum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Life (Yrs) | 5 years | 5 years |
Member relationships [Member] | Finite-Lived Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Gross, Total, Beginning Balance | $ 3,235,000 | $ 0 |
Finite-lived Intangible Assets, Impairment/Disposal | (3,235,000) | 0 |
Accumulated Amortization | (46,500) | 0 |
Intangible Assets, Net | 6,649,500 | 3,235,000 |
Finite-lived Intangible Assets, Additions | 6,696,000 | 3,235,000 |
Intangible Assets, Gross, Total, Ending Balance | $ 6,696,000 | 3,235,000 |
Patient management platform [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Life (Yrs) | 5 years |  |
Patient management platform [Member] | Finite-Lived Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Gross, Total, Beginning Balance | $ 0 |  |
Finite-lived Intangible Assets, Impairment/Disposal | 0 |  |
Accumulated Amortization | (34,336) |  |
Intangible Assets, Net | 2,025,664 |  |
Finite-lived Intangible Assets, Additions | 2,060,000 |  |
Intangible Assets, Gross, Total, Ending Balance | $ 2,060,000 | $ 0 |

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