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Business and Basis of Consolidation- Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 Segment
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Number Of Reporting Units | 4

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- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reporting Unit -URI http://asc.fasb.org/extlink&oid=6523643 + Details
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