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Debt - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2012
Apr. 30, 2012
Sep. 30, 2014
Dec. 31, 2012
Debt Instrument [Line Items]        
Provisions in future incremental borrowings     $ 150,000  
Minimum percentage of senior secured term loan for interest rate protection     25.00%  
Amount available for dividend payments under restrictive covenants     105,100  
Revolving Credit Facility [Member]
       
Debt Instrument [Line Items]        
Date of maturity     Apr. 27, 2016  
Date of maturity     2013-01  
Maximum borrowing capacity   25,000 10,000  
Maximum borrowing capacity prior limit   30,000    
Outstanding balance on the revolving credit facility     0  
Revolving Credit Facility [Member] | Interest Rate Option, LIBOR Based [Member]
       
Debt Instrument [Line Items]        
Interest rate     1.00%  
Interest rate description     LIBOR (subject to a 1.00% floor) plus a margin of 4.50%  
Interest rate, margin added     4.50%  
Commitment fees on unused portion of facility     0.50%  
Revolving Credit Facility [Member] | Interest Rate Option, Base Rate Based [Member]
       
Debt Instrument [Line Items]        
Interest rate     2.00%  
Interest rate description     Base Rate (subject to a 2.00% floor) plus a margin of 3.50%  
Interest rate, margin added     3.50%  
Maximum [Member]
       
Debt Instrument [Line Items]        
Leverage ratio     2.75  
Minimum [Member]
       
Debt Instrument [Line Items]        
Leverage ratio     1.00  
Default in payment of principal     10,000  
7.375% Senior Secured Notes [Member]
       
Debt Instrument [Line Items]        
Senior secured notes, aggregate principal amount issued   210,000    
Debt instrument issuance   2012-04    
Interest rate 7.375% 7.375%    
Date of maturity May 15, 2019     May 15, 2019
Date of maturity       2016-01
Senior secured term loan, outstanding amount (Jan 2016)   198,700    
Interest payable periods     May 15 and November 15 of each year  
Debt issuance costs     8,600  
Percentage of principal amount, redemption price     107.375%  
Repurchase of senior secured notes purchase price percentage     101.00%  
7.375% Senior Secured Notes [Member] | Secured Term Loan Facility [Member]
       
Debt Instrument [Line Items]        
Senior secured notes, aggregate principal amount issued   $ 265,000    
7.375% Senior Secured Notes [Member] | Maximum [Member]
       
Debt Instrument [Line Items]        
Percentage of aggregate principal amount, maximum redeemable     35.00%  
Percentage of principal amount redeemed at redemption date     105.53%  
7.375% Senior Secured Notes [Member] | Minimum [Member]
       
Debt Instrument [Line Items]        
Minimum percentage of aggregate principal amount outstanding, excluding the redemption date     65.00%  
Percentage of principal amount redeemed at redemption date     100.00%