XML 130 R120.htm IDEA: XBRL DOCUMENT v2.4.0.6
Income Taxes - Expected Income Tax Expense /(Benefit) using Federal Statutory Rate (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Expected Income Tax Expense [Line Items]      
Federal statutory rate 35.00% 35.00% 35.00%