Debt - Additional Information (Details) (USD $)
0 Months Ended 3 Months Ended
Sep. 13, 2013
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2013
Debt Instrument [Line Items]        
Term loan $ 250,000,000     $ 250,000,000
Maturity date of term loan Sep. 13, 2018      
Debt instrument description of variable rate basis   a $250.0 million term loan (the “Term Loan”) maturing on September 13, 2018 (the “Maturity Date”), which bears interest at the Company’s option at either a base rate plus a spread of 0.50% to 1.00%, or a reserve adjusted LIBOR rate plus a spread of 1.50% to 2.00% based on the Company’s consolidated leverage ratio for the preceding four fiscal quarters.    
Term loan quarterly installments   1,600,000    
Default interest rate applicable for any overdue principal   2.00%    
Default interest rate for base rate loans for any other overdue amounts   2.00%    
Weighted average interest rate   2.11%    
Accrued interest on Term loan   500,000    
Term loan, current   6,250,000 6,250,000  
Long-term debt   $ 234,375,000 $ 235,938,000  
Base Rate | Minimum        
Debt Instrument [Line Items]        
Term loan interest rate, applicable margin 0.50%      
Base Rate | Maximum        
Debt Instrument [Line Items]        
Term loan interest rate, applicable margin 1.00%      
LIBOR rate plus | Minimum        
Debt Instrument [Line Items]        
Term loan interest rate, applicable margin 1.50%      
LIBOR rate plus | Maximum        
Debt Instrument [Line Items]        
Term loan interest rate, applicable margin 2.00%