Accrued Expenses and Other Current Liabilities - Accrued Expenses and Other Current Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Payables And Accruals [Abstract]
Accrued salary, bonus, and related benefits	$ 32,449	$ 29,438
Accrued marketing costs	26,225	11,941
Accrued charitable foundation payments	6,150	6,757
Accrued treasury share purchases	4,756
Other	25,588	15,100
Total accrued expenses and other current liabilities	$ 95,168	$ 63,236