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Income Tax - Reconciliation of US Statutory Federal Tax Rate (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Tax Disclosure [Abstract]        
US federal statutory rate 35.00% 35.00% 35.00% 35.00%
Non-US income taxed at different rates (12.00%) (12.00%) (11.00%) (12.00%)
Charges and credits (See Note 2)       (2.00%)
Other (1.00%)   (2.00%)  
Effective income tax rate 22.00% 23.00% 22.00% 21.00%