Investments in Other Entities (Summarized Balance Sheets and Statements of Income) (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
LaSalle Medical Associates IPA [Member]
Assets
Cash and cash equivalents	$ 21,943,637		$ 21,065,105
Receivables, net	2,276,731		2,433,116
Other current assets	2,173,110		1,565,606
Loan receivable	1,250,000		1,250,000
Restricted cash	664,612		662,109
Total assets	28,308,090		26,975,936
Liabilities and Stockholders' Equity
Current liabilities	25,511,420		20,353,337
Stockholders' equity	2,796,670		6,622,599
Total liabilities and stockholders' equity	28,308,090		26,975,936
Statements of Income
Revenues	110,311,466	$ 97,902,002
Expenses	113,744,898	95,847,786
Net income	(3,433,432)	2,054,216
Universal Care Inc [Member]
Assets
Cash and cash equivalents	27,874,357		21,872,894
Receivables, net	29,042,535		18,618,760
Other current assets	19,541,123		13,021,520
Other assets	3,259,848		3,754,470
Property and equipment, net	2,132,063		1,576,621
Total assets	81,849,926		58,844,265
Liabilities and Stockholders' Equity
Current liabilities	68,941,956		54,421,532
Other liabilities	15,036,729		10,051,952
Stockholders' equity	(2,128,759)		(5,629,219)
Total liabilities and stockholders' equity	81,849,926		$ 58,844,265
Statements of Income
Revenues	149,825,595	91,586,434
Expenses	146,614,334	90,759,639
Income before (benefit) provision for income taxes	3,211,261	826,795
(Benefit) provision for income taxes	(289,200)	330,700
Net income	$ 3,500,461	$ 496,095