Number and Cost of Employee Stock Plan Repurchases (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012
Stockholders Equity Note [Line Items]
Employee stock plan repurchased (in shares)	598	1,019
Employee stock plan repurchased	$ 21,366	$ 30,117

Value of shares repurchased in connection with employee stock plans, whereby Company shares were tendered by employees for the payment of applicable withholding taxes and/or exercise price.

No definition available.

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Balance Type:	debit
Period Type:	duration