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Income Taxes - Reconciliation of Panama Statutory Federal Tax Rate to Consolidated Effective Tax Rate (Detail)
12 Months Ended
Dec. 22, 2017
Dec. 21, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule Of Income Tax [Line Items]          
Panama federal statutory rate 21.00% 35.00% 25.00% 25.00% 25.00%
Non-Panama operations     14.00% (14.00%) 29.00%
Change in valuation allowance for deferred tax assets 21.00%        
Audit settlements and reserves     1.00% 14.00% 9.00%
Other (primarily tax on unremitted earnings)     1.00% 2.00% 7.00%
Effective tax rate attributable to continuing operations     26.00% 51.00% 80.00%
Domestic Country [Member]          
Schedule Of Income Tax [Line Items]          
Change in valuation allowance for deferred tax assets     (18.00%) 49.00% 52.00%
Foreign Country [Member]          
Schedule Of Income Tax [Line Items]          
Change in valuation allowance for deferred tax assets     3.00% (25.00%) (42.00%)