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Deferred Finance Costs - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Original Revolving Credit Facility [Member]
Dec. 31, 2013
Amended Credit Facility [Member]
Dec. 31, 2013
Revolving Credit Facility [Member]
Aug. 28, 2013
Revolving Credit Facility [Member]
Dec. 31, 2011
Revolving Credit Facility [Member]
Aug. 28, 2013
Revolving Credit Facility [Member]
Amended Credit Facility [Member]
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Line Items]                    
Term of revolving credit facility             5 years     5 years
Finance cost capitalized $ 0.9 $ 0.9                
Credit facility maximum borrowing capacity         100 150   100 100 150
Additional borrowing capacity 30 50                
Credit Facility Term Ends   2016-12                
Amortization of deferred finance costs   $ 0.4 $ 0.4 $ 0.5