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Summary of Goodwill (Detail) $ in Thousands | 9 Months Ended
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Sep. 30, 2021 USD ($)
Goodwill [Line Items] |  |
Beginning Balance | $ 1,253,840 | [1]
Foreign currency translation adjustments | (3,705) |
Ending Balance | 1,250,135 | [1]
U.S. Operating Segment |  |
Goodwill [Line Items] |  |
Beginning Balance | 1,182,853 | [1]
Ending Balance | 1,182,853 | [1]
International Operating Segment |  |
Goodwill [Line Items] |  |
Beginning Balance | 70,987 | [1]
Foreign currency translation adjustments | (3,705) |
Ending Balance | $ 67,282 | [1]
[1] | Balances are presented net of accumulated impairment losses of $214,031 for the U.S. operating segment and $43,750 for the international operating segment. See discussion of the qualitative impairment analysis performed by the Company as of September 30, 2021 at Note 13.

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