Eliminated Upon Consolidation Included In Accompanying Consolidated Balance Sheets (Detail) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 99,749,199	$ 54,824,580	$ 59,014,715
Restricted cash - short-term	18,005,661	101,132
Investment in marketable securities	1,143,095	1,051,807
Receivables, net	20,117,304	22,275,896
Prepaid expenses and other current assets	3,126,866	1,852,144
Total current assets	144,159,562	81,156,298
Noncurrent assets
Land, property and equipment, net	13,814,306	10,373,333
Intangible assets, net	103,533,558	108,094,049
Goodwill	189,847,202	103,407,351	100,851,144
Loans receivable - related parties	5,000,000	5,200,000
Loan receivable	10,000,000	0
Investments in other entities - equity method	21,903,524	24,256,065
Investments in other entities - cost method	0	10,575,002
Restricted cash - long-term	745,235	0
Other assets	1,632,406	1,597,978
Total noncurrent assets	346,476,231	268,842,664
Total assets	490,635,793	349,998,962
Current liabilities
Accounts payable and accrued expenses	13,279,620	8,083,277
Fiduciary accounts payable	2,017,437	1,050,739
Medical liabilities	63,972,318	18,957,465	$ 16,011,519
Bank loan, short-term	510,391	0
Capital lease obligations	98,738	102,348
Total current liabilities	109,601,999	50,625,831
Noncurrent liabilities
Deferred tax liability	24,916,598	46,932,207
Liability for unissued equity shares	1,185,025	1,997,650
Capital lease obligations, net of current portion	619,001	0
Total noncurrent liabilities	44,720,624	48,929,857
Total liabilities	154,322,623	99,555,688
Variable Interest Entity, Primary Beneficiary [Member]
Current assets
Cash and cash equivalents	54,686,370	42,452,619
Restricted cash - short-term	18,005,661	101,132
Fiduciary cash	2,017,437	1,050,739
Investment in marketable securities	1,057,090	1,051,807
Receivables, net	15,183,483	21,025,668
Prepaid expenses and other current assets	1,821,328	727,743
Total current assets	92,771,369	66,409,708
Noncurrent assets
Land, property and equipment, net	10,167,689	7,294,994
Intangible assets, net	70,841,907	84,473,335
Goodwill	60,012,316	56,213,448
Loans receivable - related parties	5,000,000	5,200,000
Loan receivable	5,000,000	0
Investments in other entities - equity method	21,903,524	24,256,065
Investments in other entities - cost method	4,320,000	4,320,000
Restricted cash - long-term	745,235	0
Other assets	1,371,664	1,596,848
Total noncurrent assets	179,362,335	183,354,690
Total assets	272,133,704	249,764,398
Current liabilities
Accounts payable and accrued expenses	3,625,610	4,213,551
Incentives payable	21,500,000	19,621,645
Fiduciary accounts payable	2,017,437	1,050,739
Medical liabilities	25,186,240	18,957,465
Income taxes payable	1,463,540	2,999,225
Amount due to affiliate	24,889,717	3,204,334
Bank loan, short-term	510,391	0
Capital lease obligations	98,738	0
Total current liabilities	79,291,673	50,046,959
Noncurrent liabilities
Deferred tax liability	20,970,766	36,148,696
Liability for unissued equity shares	1,185,025	1,008,925
Capital lease obligations, net of current portion	619,001	0
Total noncurrent liabilities	22,774,792	37,157,621
Total liabilities	$ 102,066,465	$ 87,204,580