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Income Taxes - Reconciliation of US Statutory Federal Tax Rate (Detail)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Income Tax Reconciliation Of U S Statutory Federal Tax Rate Detail [Line Items]      
US federal statutory rate 21.00% 21.00% 35.00%
State tax   (2.00%)  
Non-US income taxed at different rates   (2.00%) 29.00%
Enactment of US tax reform (See Note 3)     (6.00%)
Other 1.00%   7.00%
Effective income tax rate 3.00% 17.00% (28.00%)
Charges And Credits      
Disclosure Income Tax Reconciliation Of U S Statutory Federal Tax Rate Detail [Line Items]      
Charges and credits (See Note 3) (19.00%)   (93.00%)