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Shareholders' Equity - Schedule of Dividend Declared (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dividends Declared [Line Items]  
Record Date Mar. 17, 2014
Payment Date Mar. 31, 2014
Record Date One [Member]
 
Dividends Declared [Line Items]  
Dividend Per Share $ 0.050
Record Date Dec. 17, 2013
Payment Date Dec. 31, 2013
Record Date Two [Member]
 
Dividends Declared [Line Items]  
Dividend Per Share $ 0.050
Record Date Sep. 16, 2013
Payment Date Sep. 30, 2013
Record Date Three [Member]
 
Dividends Declared [Line Items]  
Dividend Per Share $ 0.050
Record Date Jun. 14, 2013
Payment Date Jun. 28, 2013
Record Date Four [Member]
 
Dividends Declared [Line Items]  
Dividend Per Share $ 0.050
Record Date Mar. 18, 2013
Payment Date Mar. 28, 2013
Record Date Five [Member]
 
Dividends Declared [Line Items]  
Dividend Per Share $ 0.045
Record Date Dec. 14, 2012
Payment Date Dec. 28, 2012
Record Date Six [Member]
 
Dividends Declared [Line Items]  
Dividend Per Share $ 0.045
Record Date Sep. 14, 2012
Payment Date Sep. 28, 2012
Record Date Seven [Member]
 
Dividends Declared [Line Items]  
Dividend Per Share $ 0.035
Record Date Jun. 15, 2012
Payment Date Jun. 29, 2012
Record Date Eight [Member]
 
Dividends Declared [Line Items]  
Dividend Per Share $ 0.035
Record Date Mar. 20, 2012
Payment Date Mar. 30, 2012