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Description of Business and Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Detail) | 12 Months Ended
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Dec. 31, 2017
Buildings [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful lives of property and equipment | 40 years
Land Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful lives of property and equipment | 20 years
Furniture, fixtures and equipment [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful lives of property and equipment | 5 years
Furniture, fixtures and equipment [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful lives of property and equipment | 8 years
Leasehold Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful lives of property and equipment | The shorter of the lease term or useful life

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- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68071081&loc=d3e1205-110223 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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