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Cash Dividends Declared (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dividend Payment 1st
 
Dividend Declared [Line Items]  
Dividend per share $ 0.02500
Date declared Mar. 06, 2012
Date of record May 01, 2012
Payment date May 15, 2012
Dividend Payment 2nd
 
Dividend Declared [Line Items]  
Dividend per share $ 0.02500
Date declared Jun. 13, 2012
Date of record Aug. 01, 2012
Payment date Aug. 15, 2012
Dividend Payment 3rd
 
Dividend Declared [Line Items]  
Dividend per share $ 0.02500
Date declared Jul. 31, 2012
Date of record Nov. 01, 2012
Payment date Nov. 15, 2012
Dividend Payment 4th
 
Dividend Declared [Line Items]  
Dividend per share $ 0.02500
Date declared Nov. 02, 2012
Date of record Feb. 01, 2013
Payment date Feb. 15, 2013
Dividend Payment 5th
 
Dividend Declared [Line Items]  
Dividend per share $ 0.03125
Date declared Mar. 12, 2013
Date of record May 01, 2012
Payment date May 15, 2013
Dividend Payment 6th
 
Dividend Declared [Line Items]  
Dividend per share $ 0.03125
Date declared Jun. 13, 2013
Date of record Aug. 01, 2013
Payment date Aug. 15, 2013
Dividend Payment 7th
 
Dividend Declared [Line Items]  
Dividend per share $ 0.03125
Date declared Aug. 02, 2013
Date of record Nov. 01, 2013
Payment date Nov. 15, 2013
Dividend Payment 8th
 
Dividend Declared [Line Items]  
Dividend per share $ 0.03750
Date declared Oct. 31, 2013
Date of record Jan. 31, 2014
Payment date Feb. 14, 2014