Related Party Transactions - Additional Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Related Party Transaction [Line Items]
Reimbursement Agreements termination period by either party	90 days
Insurance program renewal period	5 years
Insurance program renewal term period	January 31, 2012 through January 31, 2017
Reimbursement Agreement
Related Party Transaction [Line Items]
Reimbursements from (to) related party	$ 2.3	$ 3.8
Due from Related Parties	$ 0.2		$ 0