Quarterly report pursuant to Section 13 or 15(d)

Summary of Goodwill (Parenthetical) (Detail)

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Summary of Goodwill (Parenthetical) (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
U.S. Operating Segment  
Goodwill [Line Items]  
Accumulated impairment losses $ 214,031
International Operating Segment  
Goodwill [Line Items]  
Accumulated impairment losses $ 27,622