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Basis of Presentation and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Summary of Estimated Useful Lives Property and Equipment | Depreciation and amortization are provided on a straight-line basis over the following estimated useful lives:
Buildings |  | 25 to 40 years
Furniture and fixtures |  | 5 to 10 years
Capitalized software |  | 2 to 7 years
Equipment |  | 3 to 7 years

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