Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]
General and Administrative Expense	$ 48,200,000	$ 25,300,000	$ 28,100,000
Cash And Cash Equivalents Highly Liquid Investments Maximum Maturity Period	3 months
Accrued interest or penalties related to income tax	$ 0	$ 0	$ 0
Deferred debt issuance costs	2,211,000
2015 Credit Facility
Summary Of Significant Accounting Policies [Line Items]
Deferred debt issuance costs	$ 1,900,000
Referral Solutions Group LLC
Summary Of Significant Accounting Policies [Line Items]
Business acquisition, effective date of acquisition	Jul. 02, 2015
Revenues | Blue Cross Blue Shield | CALIFORNIA
Summary Of Significant Accounting Policies [Line Items]
Concentration percentage	11.10%	10.50%	12.30%
Revenues | Blue Cross Blue Shield | TEXAS
Summary Of Significant Accounting Policies [Line Items]
Concentration percentage	12.50%	13.30%
Revenues | Aetna
Summary Of Significant Accounting Policies [Line Items]
Concentration percentage	11.50%	12.90%	12.10%
Revenues | United Behavioral Health
Summary Of Significant Accounting Policies [Line Items]
Concentration percentage		10.50%	10.30%
Revenues | Anthem Blue Cross Blue Shield | COLORADO
Summary Of Significant Accounting Policies [Line Items]
Concentration percentage	15.10%	18.10%
Accounts Receivable | Blue Cross Blue Shield | CALIFORNIA
Summary Of Significant Accounting Policies [Line Items]
Concentration percentage	15.00%	13.00%
Accounts Receivable | Blue Cross Blue Shield | TEXAS
Summary Of Significant Accounting Policies [Line Items]
Concentration percentage		10.60%
Accounts Receivable | Anthem Blue Cross Blue Shield | COLORADO
Summary Of Significant Accounting Policies [Line Items]
Concentration percentage	22.40%	20.70%