Income Tax - Schedule of Interest Expense and Penalties (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Uncertain Tax Positions [Line Items]
Net increase (decrease) in interest expense related to unrecognized tax positions	$ (1,902)	$ 245	$ 4,751
Net increase (decrease) in penalties related to unrecognized tax positions	$ (787)	$ (3,039)	$ 12,022

This element represents the recognized expense for the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties or, if not recognizing the expense in the period in which the tax return was initially filed, the expense is generally recognized in the period in which the enterprise's judgment about meeting the minimum statutory threshold changes.

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This element represents interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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