Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Taxes [Line Items]
Provision for income taxes	$ 7,322	$ (4,638)
Effective tax rate	47.00%	48.00%
Decrease in deferred tax assets associated with changes in Accumulated Other Comprehensive Income (Loss)	(278)
Deferred tax asset, foreign currency translation adjustment gain (loss)	292
Increase in unrecognized tax benefits	526
Unrecognized tax benefits that would affect the effective tax rate	474
Unrecognized tax benefits interest and penalties	115
Unrecognized tax benefits accrued interest and penalties	165
Pan
Income Taxes [Line Items]
Deferred Tax Assets	$ 1,349