Annual report pursuant to Section 13 and 15(d)

Reconciliation of Statutory Federal Income Tax Rate to Effective Income Tax Rate (Detail)

v2.4.0.6
Reconciliation of Statutory Federal Income Tax Rate to Effective Income Tax Rate (Detail)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Reconciliation of Statutory Federal Tax Rate [Line Items]      
Statutory U.S. federal income tax rate 35.00% 35.00% 35.00%
U.S. state and local income taxes (net of federal benefit) 2.00% 2.40% 1.20%
Non-U.S. tax rate differential (0.40%) (0.70%) (1.60%)
Nondeductible/nontaxable items (0.10%) 0.30% 1.00%
U.S. federal tax credits (1.70%) (1.90%) (3.50%)
Other (0.70%) 1.80% 3.90%
Effective income tax rate 34.10% 36.90% 36.00%