Number and Cost of Employee Stock Plan Repurchases (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011
Stockholders Equity Note [Line Items]
Employee stock plan repurchased (in shares)	980	193
Employee stock plan repurchased	$ 29,019	$ 5,694

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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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration