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Effective Income Tax Reconciliation (Parenthetical) (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Basic earnings per share amounts of the benefit resulting from the "Approved and Privileged Enterprise" status $ 0.26 $ 0.31 $ 0.22
Diluted earnings per share amounts of the benefit resulting from the "Approved and Privileged Enterprise" status $ 0.26 $ 0.30 $ 0.22