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Income Taxes - Reconciliation of US Statutory Federal Tax Rate (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Disclosure Income Tax Reconciliation Of U S Statutory Federal Tax Rate Detail [Line Items]        
US federal statutory rate 35.00% 35.00% 35.00% 35.00%
State tax     2.00%  
Non-US income taxed at different rates     (22.00%) (12.00%)
Other     1.00% (2.00%)
Effective income tax rate     15.00% 22.00%
Charges And Credits        
Disclosure Income Tax Reconciliation Of U S Statutory Federal Tax Rate Detail [Line Items]        
Charges and credits (See Note 2)     (1.00%) 1.00%