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Reconciliation Between Effective Tax Rate and U.S. Statutory Rate (Parenthetical) (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Basic and diluted earnings per share amounts of the benefit resulting from the "Approved Enterprise" and "Benefited Enterprise" status $ 0.08 $ 0.04 $ 0.07