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Intangible Assets - Goodwill and Net Carrying Amounts (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Goodwill
Goodwill gross, beginning balance		$ 964,980
Accumulated impairment loss, beginning balance		(190,041)
Goodwill net, beginning balance		774,939
Foreign currency translation adjustments		(15,748)
Impairment loss	$ (194,500)		$ (194,500)
Goodwill gross, ending balance		949,232
Accumulated impairment loss, ending balance		(190,041)
Goodwill net, ending balance		759,191
Trade Name
Intangible Assets
Indefinite lived intangible asset, Beginning balance		659
Indefinite lived intangible asset, foreign currency translation adjustments		(15)
Indefinite lived intangible asset, Ending balance		644
North America
Goodwill
Goodwill gross, beginning balance		565,717
Goodwill net, beginning balance		565,717
Foreign currency translation adjustments		(3,159)
Goodwill gross, ending balance		562,558
Goodwill net, ending balance		562,558
North America \| Trade Name
Intangible Assets
Indefinite lived intangible asset, Beginning balance		200
Indefinite lived intangible asset, Ending balance		200
Europe And Africa
Goodwill
Goodwill gross, beginning balance		246,549
Accumulated impairment loss, beginning balance		(50,003)
Goodwill net, beginning balance		196,546
Foreign currency translation adjustments		(11,637)
Goodwill gross, ending balance		234,912
Accumulated impairment loss, ending balance		(50,003)
Goodwill net, ending balance		184,909
Europe And Africa \| Trade Name
Intangible Assets
Indefinite lived intangible asset, Beginning balance		459
Indefinite lived intangible asset, foreign currency translation adjustments		(15)
Indefinite lived intangible asset, Ending balance		444
Australia And New Zealand
Goodwill
Goodwill gross, beginning balance		152,714
Accumulated impairment loss, beginning balance		(140,038)
Goodwill net, beginning balance		12,676
Foreign currency translation adjustments		(952)
Goodwill gross, ending balance		151,762
Accumulated impairment loss, ending balance		(140,038)
Goodwill net, ending balance		$ 11,724