Summary of Changes in Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Goodwill [Line Items]
Beginning Balance	$ 895,518
Acquisitions	25,061
Write-off in connection with deconsolidation of subsidiaries	(4,057)
Foreign currency translation	(24,651)
Ending Balance	$ 891,870