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Reconciliation of Panama Statutory Federal Tax Rate to Consolidated Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Line Items]
Panama federal statutory rate	25.00%	27.50%	30.00%
Non-Panama operations	(24.70%)	(32.80%)	(27.40%)
Effect of change in tax rates	0.30%	12.00%
Valuation allowance for deferred tax assets	30.70%	2.90%	19.20%
Audit settlements	0.70%	2.80%	2.60%
Other	2.70%	1.20%	(2.00%)
Effective tax rate attributable to continuing operations	34.70%	13.60%	22.40%

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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