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Eliminated Upon Consolidation Included In Accompanying Consolidated Balance Sheets (Detail) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Current assets        
Cash and cash equivalents $ 101,132,237 $ 99,749,199 $ 65,787,183  
Restricted cash - short-term 8,040,870 18,005,661 0  
Investment in marketable securities 1,130,967 1,143,095    
Receivables, net 34,541,815 20,117,304    
Prepaid expenses and other current assets 6,622,549 3,126,866    
Total current assets 152,762,941 144,159,562    
Noncurrent assets        
Land, property and equipment, net 13,297,168 13,814,306    
Intangible assets, net 94,927,036 103,533,558    
Goodwill 189,604,746 189,847,202    
Loans receivable - related parties 7,500,000 5,000,000    
Loan receivable 10,000,000 10,000,000    
Investments in other entities - equity method 23,545,361 21,903,524    
Investment in joint venture – equity method 16,673,840 0    
Restricted cash - long-term 745,352 745,235 $ 0  
Other assets 1,515,664 1,632,406    
Total noncurrent assets 358,214,167 346,476,231    
Total assets 510,977,108 490,635,793    
Current liabilities        
Accounts payable and accrued expenses 12,587,893 13,279,620    
Fiduciary accounts payable 1,294,503 2,017,437    
Medical liabilities 66,853,335 63,972,318   $ 18,957,465
Bank loan, short-term 278,017 510,391    
Capital lease obligations 100,228 98,738    
Total current liabilities 89,118,106 109,601,999    
Noncurrent liabilities        
Deferred tax liability 27,758,780 24,916,598    
Liability for unissued equity shares 1,185,025 1,185,025    
Dividends payable 8,000,000      
Capital lease obligations, net of current portion 568,512 619,001    
Total noncurrent liabilities 51,129,527 44,720,624    
Total liabilities 140,247,633 154,322,623    
Variable Interest Entity, Primary Beneficiary [Member]        
Current assets        
Cash and cash equivalents 46,405,310 54,686,370    
Restricted cash - short-term 8,040,870 18,005,661    
Fiduciary cash 1,294,503 2,017,437    
Investment in marketable securities 1,061,022 1,057,090    
Receivables, net 28,601,680 15,183,483    
Prepaid expenses and other current assets 1,531,872 1,821,328    
Total current assets 86,935,257 92,771,369    
Noncurrent assets        
Land, property and equipment, net 9,990,830 10,167,689    
Intangible assets, net 64,683,046 70,841,907    
Goodwill 60,012,316 60,012,316    
Loans receivable - related parties 7,500,000 5,000,000    
Loan receivable 5,000,000 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 23,545,361 21,903,524    
Investment in joint venture – equity method 8,336,920 0    
Restricted cash - long-term 745,352 745,235    
Other assets 1,063,539 1,371,664    
Total noncurrent assets 185,602,364 179,362,335    
Total assets 272,537,621 272,133,704    
Current liabilities        
Accounts payable and accrued expenses 3,895,202 3,625,610    
Incentives payable 5,000,000 21,500,000    
Fiduciary accounts payable 1,294,503 2,017,437    
Medical liabilities 20,243,608 25,186,240    
Income taxes payable 2,882,773 1,463,540    
Amount due to affiliate 17,624,486 24,889,717    
Bank loan, short-term 278,017 510,391    
Capital lease obligations 100,228 98,738    
Total current liabilities 51,318,817 79,291,673    
Noncurrent liabilities        
Deferred tax liability 24,033,663 20,970,766    
Liability for unissued equity shares 1,185,025 1,185,025    
Dividends payable 617,210 0    
Capital lease obligations, net of current portion 568,512 619,001    
Total noncurrent liabilities 26,404,410 22,774,792    
Total liabilities $ 77,723,227 $ 102,066,465