Deferred Tax Assets (Liabilities) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Deferred tax assets:
Compensation	$ 80,577	$ 70,915
Receivables	10,375	10,430
Other	7,992	5,307
Deferred tax liabilities:
Intangible assets	(59,122)	(49,447)
Prepaid assets	(8,476)	(8,997)
Long-lived assets	(18,463)	(10,095)
Undistributed earnings of foreign subsidiaries	(5,324)	(4,807)
Other	(7)	(4)
Net deferred tax assets	$ 7,552	$ 13,302