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Income Tax - Reconciliation of US Statutory Federal Tax Rate (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Tax Disclosure [Abstract]        
US federal statutory rate 35.00% 35.00% 35.00% 35.00%
US state income taxes   1.00% 1.00% 1.00%
Non-US income taxed at different rates (12.00%) (11.00%) (12.00%) (11.00%)
Charges (See Note 2) (6.00%)   (4.00%)  
Other       (1.00%)
Effective income tax rate 17.00% 25.00% 20.00% 24.00%