Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended			12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule Of Income Tax [Line Items]
Change in net deferred taxes				$ 1,742,000
Net deferred tax asset				1,479,000
Foreign currency translation adjustments				72,000
Net deferred benefit , reserve for uncertain tax positions				191,000
Increase to income tax expense	9,397,000	12,237,000	52,751,000
Deferred tax assets, valuation allowance	110,844,000			151,097,000	110,844,000
Tax credit carryforwards	9,402,000			6,024,000	9,402,000
Tax credit carryforward beginning expiration year				2020
Adjustment to previously estimated tax liabilities				142,000	2,000	515,000
Liability for income taxes associated with uncertain tax positions	9,875,000			7,064,000	9,875,000	9,121,000	15,831,000
Tax benefits associated with potential transfer pricing adjustments				3,148,000
Tax benefits associated with state income taxes and other timing adjustments				748,000
Net amount of unrecognized tax benefit related to uncertain tax positions that would impact, if recognized, effective income tax rate				3,168,000
Interest and penalties related to income tax matters				44,000	242,000	(490,000)
Income tax accrued for payment of interest and penalties	890,000			934,000	890,000
Undistributed earnings				105,383,000
Withholding taxes				1,000,000
United States
Schedule Of Income Tax [Line Items]
Increase to income tax expense					52,455,000
Deferred tax assets, valuation allowance	110,844,000			151,097,000	110,844,000
Federal
Schedule Of Income Tax [Line Items]
Tax credit carryforwards				4,354,000
State
Schedule Of Income Tax [Line Items]
Tax credit carryforwards				$ 6,985,000