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Subsequent Events - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 0 Months Ended 0 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 14, 2014
Senior Secured Notes [Member]
Nov. 30, 2011
Senior Secured Notes [Member]
Mar. 14, 2014
November Two Thousand Eleven Senior Notes [Member]
May 01, 2014
Subsequent Events [Member]
Apr. 14, 2014
Subsequent Events [Member]
Senior Secured Notes [Member]
Apr. 14, 2014
Subsequent Events [Member]
November Two Thousand Eleven Senior Notes [Member]
Subsequent Event [Line Items]                
Dividends declared per share $ 0.11 $ 0.11       $ 0.11    
Date of payment of dividend           May 27, 2014    
Date of record of dividend           May 15, 2014    
Date of announcement of dividend           May 01, 2014    
Aggregate face amount of debt redeemed     $ 45.0       $ 45.0  
Redemption price as a percentage of face amount     106.563%       106.563%  
Total amount of debt to be retired     50.0   5.0     5.0
Outstanding principal amount of the debt       $ 150.0     $ 150.0