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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

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