Annual report pursuant to Section 13 and 15(d)

Dividends (Parenthetical) (Detail)

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Dividends (Parenthetical) (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dividend Declared [Line Items]      
Dividends related to outstanding restricted stock units $ 772 $ 894 $ 684
Effective Date of change in amount of quarterly dividend Aug. 15, 2013    
Revised quarterly dividend $ 0.25