Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions			12 Months Ended
	Sep. 23, 2015	Mar. 06, 2013	Dec. 31, 2017
General and Administrative Expense
Loss Contingencies [Line Items]
Litigation settlement, amount awarded to other party			$ 46.7
BHMI
Loss Contingencies [Line Items]
Loss contingency, damages sought, value	$ 43.8
Loss contingency, name of plaintiff	Baldwin Hackett & Meeks, Inc.
Loss contingency, damages		$ 43.8
Loss contingency, attorneys fees and costs		$ 2.7
Litigation settlement, amount awarded to other party			48.1
BHMI | General and Administrative Expense
Loss Contingencies [Line Items]
Litigation settlement, amount awarded to other party			46.7
BHMI | Interest Expense [Member]
Loss Contingencies [Line Items]
Litigation settlement, amount awarded to other party			$ 1.4