Deferred Tax Assets (Liabilities) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Compensation	$ 96,660	$ 80,577
Receivables	11,836	10,375
Other	9,443	7,992
Deferred tax liabilities:
Intangible assets	(109,334)	(59,122)
Prepaid assets	(7,825)	(8,476)
Long-lived assets	(21,171)	(18,463)
Undistributed earnings of foreign subsidiaries	(12,857)	(5,324)
Other	(85)	(7)
Net deferred tax (liabilities) assets	$ (33,333)	$ 7,552