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Differentiation between Federal Statutory Tax Rate and Effective Tax Rate (Detail)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Tax Rate Reconciliation [Line Items]
Statutory provision	35.00%	35.00%
State taxes, net of federal benefit	0.60%	0.60%
Foreign effective tax rates different from US statutory rate	(11.80%)	(12.80%)
Effective Income Tax Rate	23.80%	22.80%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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