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Debt - Additional Information (Detail) (USD $)
0 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Revolving Credit Facility [Member]
Oct. 23, 2014
Revolving Credit Facility [Member]
Subsequent Event [Member]
Dec. 17, 2013
Revolving Credit Facility [Member]
Revolver Loans Second Amendment Portion Effective January 1, 2014 [Member]
Dec. 17, 2013
Revolving Credit Facility [Member]
Revolver Loans Second Amendment Portion Effective July 1, 2014 [Member]
Sep. 30, 2014
Revolving Credit Facility [Member]
Revolver Loans [Member]
Line of Credit Facility [Line Items]            
Revolving loans in a collective maximum principal amount       $ 125,000,000 $ 100,000,000 $ 100,000,000
Termination date of the Credit Agreement     Jan. 09, 2016      
Remaining available borrowing capacity   63,000,000        
Outstanding borrowings under its revolving credit facility $ 3,000,000 $ 3,000,000