Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accounting Policies [Abstract]
Health insurance maximum risk of loss liability per employee insurance plan (up to)			$ 350,000
Health insurance maximum aggregate amount of risk of loss liability for employee insurance plans (up to)			$ 450,000
Common stock equivalents (in shares)	177	321	162	246