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Taxes - Reconciliation of the United States Federal Statutory Corporate Tax Rate to Company's Effective Tax Rate or Income Tax Provision (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of the United States federal statutory corporate tax rate to the Company's effective tax rate or income tax provision
Income tax provision at federal statutory rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	1.00%	1.00%	1.00%
Foreign tax rate differential	(14.00%)	(15.00%)	(15.00%)
Tax credit		(1.00%)	(1.00%)
Discrete tax events			(1.00%)
Other	(1.00%)
Income tax provision	21.00%	20.00%	19.00%

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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- Definition

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit that is attributable to changes in the income tax laws or rates.

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