Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Additional Information (Detail)

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Goodwill and Other Intangible Assets - Additional Information (Detail)
9 Months Ended
Sep. 30, 2018
Community
Country
U.S. Operating Segment  
Goodwill [Line Items]  
Number of reporting unit | Community 19
International Operating Segment  
Goodwill [Line Items]  
Number of reporting unit | Country 7