Eliminated Upon Consolidation Included In Accompanying Consolidated Balance Sheets (Detail) - USD ($)	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 119,779,499	$ 99,749,199	$ 76,293,655
Restricted cash – short-term	4,218,176	18,005,661	0
Investment in marketable securities	1,141,890	1,143,095
Receivables, net	70,084,171	20,117,304
Prepaid expenses and other current assets	4,175,308	3,126,866
Total current assets	202,833,453	144,159,562
Noncurrent assets
Land, property and equipment, net	12,909,206	13,814,306
Intangible assets, net	90,762,980	103,533,558
Goodwill	189,604,746	189,847,202
Loans receivable – related parties	7,500,000	5,000,000
Loan receivable	5,000,000	10,000,000
Investments in other entities – equity method	24,122,895	21,903,524
Investment in joint venture – equity method	16,673,840	0
Restricted cash – long-term	745,412	745,235	$ 0
Other assets	1,341,337	1,632,406
Total noncurrent assets	349,065,416	346,476,231
Total assets	551,898,869	490,635,793
Current liabilities
Accounts payable and accrued expenses	44,974,805	13,279,620
Fiduciary accounts payable	3,434,409	2,017,437
Medical liabilities	33,505,423	63,972,318		$ 18,957,465
Bank loan	159,906	510,391
Capital lease obligations	100,982	98,738
Total current liabilities	92,245,266	109,601,999
Noncurrent liabilities
Deferred tax liability	34,651,670	24,916,598
Liability for unissued equity shares	1,185,025	1,185,025
Capital lease obligations, net of current portion	542,982	619,001
Total noncurrent liabilities	49,379,677	44,720,624
Total liabilities	141,624,943	154,322,623
Variable Interest Entity, Primary Beneficiary [Member]
Current assets
Cash and cash equivalents	55,971,643	54,686,370
Restricted cash – short-term	4,218,176	18,005,661
Fiduciary cash	3,434,409	2,017,437
Investment in marketable securities	1,066,103	1,057,090
Receivables, net	59,994,370	15,183,483
Prepaid expenses and other current assets	1,796,643	1,821,328
Total current assets	126,481,344	92,771,369
Noncurrent assets
Land, property and equipment, net	9,761,142	10,167,689
Intangible assets, net	61,695,254	70,841,907
Goodwill	60,012,316	60,012,316
Loans receivable – related parties	7,500,000	5,000,000
Loan receivable	0	5,000,000
Investment in a privately held entity that does not report net asset value per share	4,725,000	4,320,000
Investments in other entities – equity method	24,122,895	21,903,524
Investment in joint venture – equity method	8,336,920	0
Restricted cash – long-term	745,412	745,235
Other assets	969,487	1,371,664
Total noncurrent assets	177,868,426	179,362,335
Total assets	304,349,770	272,133,704
Current liabilities
Accounts payable and accrued expenses	4,315,861	3,625,610
Incentives payable	5,000,000	21,500,000
Fiduciary accounts payable	3,434,409	2,017,437
Medical liabilities	20,711,286	25,186,240
Income taxes payable	1,277,817	1,463,540
Amount due to affiliate	14,650,703	24,889,717
Bank loan	159,906	510,391
Capital lease obligations	100,982	98,738
Total current liabilities	49,650,964	79,291,673
Noncurrent liabilities
Deferred tax liability	29,833,368	20,970,766
Liability for unissued equity shares	1,185,025	1,185,025
Capital lease obligations, net of current portion	542,982	619,001
Total noncurrent liabilities	31,561,375	22,774,792
Total liabilities	$ 81,212,339	$ 102,066,465