Eliminated Upon Consolidation Included In Accompanying Consolidated Balance Sheets (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 106,891,503	$ 99,749,199
Restricted cash – short-term	0	18,005,661
Investment in marketable securities	1,127,102	1,143,095
Receivables, net	7,734,631	7,602,812
Receivables, net – related party	44,651,502,000	12,088,655,000
Prepaid expenses and other current assets	8,388,231	5,144,303
Total current assets	172,862,792	144,159,562
Noncurrent assets
Land, property and equipment, net	12,721,082	13,814,306
Intangible assets, net	86,875,883	103,533,558
Goodwill	185,805,880	189,847,202	$ 103,407,351
Loans receivable - related parties	17,500,000	15,000,000
Investments in other entities - equity method	34,876,980	21,903,524
Restricted cash - long-term	745,470	745,235
Other assets	1,205,962	1,632,406
Total noncurrent assets	340,136,257	346,476,231
Total assets	512,999,049	490,635,793
Current liabilities
Accounts payable and accrued expenses	25,075,489	13,279,620
Fiduciary accounts payable	1,538,598	2,017,437
Medical liabilities	33,641,701	63,972,318	$ 18,957,465
Income taxes payable	11,621,861
Bank loan, short-term	40,257	510,391
Capital lease obligations	101,741	98,738
Total current liabilities	72,019,647	109,601,999
Noncurrent liabilities
Deferred tax liability	19,615,935	24,916,598
Liability for unissued equity shares	1,185,025	1,185,025
Capital lease obligations, net of current portion	517,261	619,001
Total noncurrent liabilities	34,318,221	44,720,624
Total liabilities	106,337,868	154,322,623
Variable Interest Entity, Primary Beneficiary [Member]
Current assets
Cash and cash equivalents	71,726,342	54,686,370
Restricted cash – short-term	0	18,005,661
Investment in marketable securities	1,066,103,000	1,057,090,000
Receivables, net	4,512,000,000	3,094,828,000
Prepaid expenses and other current assets	3,647,654,000	3,838,765,000
Total current assets	125,603,601	92,771,369
Noncurrent assets
Land, property and equipment, net	9,602,228	10,167,689
Intangible assets, net	58,984,420	70,841,907
Goodwill	56,213,450	60,012,316
Loans receivable - related parties	12,500,000	10,000,000
Investments in other entities - equity method	26,707,404	21,903,524
Restricted cash - long-term	745,470	745,235
Investment in a privately held entity that does not report net asset value per share	4,725,000	4,320,000
Other assets	839,085	1,371,664
Total noncurrent assets	170,317,057	179,362,335
Total assets	295,920,658	272,133,704
Current liabilities
Accounts payable and accrued expenses	6,378,751	3,625,610
Incentives payable	0	21,500,000
Fiduciary accounts payable	1,538,598	2,017,437
Medical liabilities	24,983,110	25,186,240
Income taxes payable	11,621,861	1,463,540
Amount due to affiliate	11,505,680	24,889,717
Bank loan, short-term	40,257	510,391
Capital lease obligations	101,741	98,738
Total current liabilities	56,169,998	79,291,673
Noncurrent liabilities
Deferred tax liability	15,693,159	20,970,766
Liability for unissued equity shares	1,185,025	1,185,025
Capital lease obligations, net of current portion	517,261	619,001
Total noncurrent liabilities	17,395,445	22,774,792
Total liabilities	$ 73,565,443	$ 102,066,465