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Income Taxes - Summary of Reconciliation of Effective Tax Rate (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of effective tax rate [abstract]      
Income taxes at Panamanian statutory rates 25.00% 25.00% 25.00%
Effect of tax rates in non - panamanian jurisdictions 0.10% (2.50%) (11.00%)
Exemption in non - taxable countries (13.30%) (12.00%) (29.10%)
Adjustment for prior period (0.10%) 0.03% (0.60%)
Provision for income taxes 11.70% 10.50% (15.70%)
Net income (loss) $ 369,658 $ 325,928 $ (240,634)
Total income tax expense 49,310 38,271 32,759
Profit (loss) excluding income tax 418,968 364,199 (207,875)
Income taxes at Panamanian statutory rates 104,742 91,050 (51,969)
Effect of tax rates in non - panamanian jurisdictions 590 (9,260) 22,936
Exemption in non - taxable countries (55,567) (43,646) 60,564
Adjustment for prior period (455) 127 1,228
Provision for income taxes $ 49,310 $ 38,271 $ 32,759