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Effective Income Tax Reconciliation (Parenthetical) (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Rate Reconciliation [Line Items]      
Basic earnings per share amounts of the benefit resulting from the "Approved and Privileged Enterprise" status $ 0.24 $ 0.21 $ 0.20
Diluted earnings per share amounts of the benefit resulting from the "Approved and Privileged Enterprise" status $ 0.23 $ 0.20 $ 0.20