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Borrowings - Senior Secured Credit Facility (Details) - USD ($)
 3 Months Ended
Apr. 15, 2015
Nov. 08, 2013
May. 01, 2013
Jul. 08, 2011
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Credit Facilities              
Interest expense         $ 7,101,000 $ 7,602,000  
Reconciliation of senior secured credit facility              
Senior secured credit facility         492,782,000   $ 493,589,000
Senior Secured Credit Facility              
Credit Facilities              
Face amount       $ 320,000,000      
Discount (as a percent)       2.00%      
Issued amount       $ 313,600,000      
Discount       $ 6,400,000 $ 1,401,000   1,498,000
Percentage of the non-voting stock of the entity's domestic subsidiaries' direct foreign subsidiaries collateralized         100.00%    
Percentage of the voting stock of the entity's domestic subsidiaries' direct foreign subsidiaries as collateral         65.00%    
Increase in principal amount outstanding   $ 106,700,000 $ 150,000,000        
Minimum principal payments as a percentage of original principal amount       15.00%      
Minimum principal payments as a percentage of outstanding principal amount   1.00%          
Outstanding principal amount   $ 510,000,000     $ 498,525,000    
Reduction in incremental spread upon consummation of qualifying initial public offering (as a percent)         0.50%    
Interest rate (as a percent)         5.25%    
Reconciliation of senior secured credit facility              
Senior secured credit facility outstanding principal         $ 498,525,000   499,800,000
Deferred financing fees         (4,342,000)   (4,713,000)
Discount       $ (6,400,000) (1,401,000)   (1,498,000)
Senior secured credit facility         492,782,000   493,589,000
Aggregate future required minimum principal payments based on the terms of loan              
2016         3,825,000    
2017         5,100,000    
2018         5,100,000    
2019 and thereafter         484,500,000    
Total maturities of long-term debt   $ 510,000,000     498,525,000    
Amortization expense related to the deferred financing fees         400,000 300,000  
Accretion related to the net carrying amount of debt discount         $ 100,000 $ 100,000  
Senior Secured Credit Facility | Prime rate              
Credit Facilities              
Additional interest margin added to fixed and variable rates (as a percent)         3.00%    
Senior Secured Credit Facility | Federal funds effective rate              
Credit Facilities              
Additional interest margin added to fixed and variable rates (as a percent)         3.00%    
Senior Secured Credit Facility | Eurodollar              
Credit Facilities              
Additional interest margin added to fixed and variable rates (as a percent)         3.00%    
Senior Secured Credit Facility | First option              
Credit Facilities              
Fixed interest rate base (as a percent)         2.25%    
Senior Secured Credit Facility | First option | Federal funds effective rate              
Credit Facilities              
Interest rate added to variable rate (as a percent)         0.50%    
Senior Secured Credit Facility | First option | Eurodollar              
Credit Facilities              
Interest rate added to variable rate (as a percent)         1.00%    
Senior Secured Credit Facility | Second option              
Credit Facilities              
Fixed interest rate base (as a percent)         1.25%    
Senior Secured Credit Facility | LIBOR rate              
Credit Facilities              
Additional interest margin added to fixed and variable rates (as a percent)         4.00%    
Revolving credit facility              
Credit Facilities              
Maximum borrowing capacity $ 100,000,000            
Commitment fee (as a percent) 0.50%            
Outstanding principal balance         $ 0   $ 0
Interest expense         100,000    
Reconciliation of senior secured credit facility              
Deferred financing fees         (600,000)    
Aggregate future required minimum principal payments based on the terms of loan              
Amortization expense related to the deferred financing fees         $ 100,000    
Revolving credit facility | Federal funds effective rate              
Credit Facilities              
Interest rate added to variable rate (as a percent) 0.50%            
Additional interest margin added to fixed and variable rates (as a percent)         3.00%    
Revolving credit facility | Eurodollar              
Credit Facilities              
Interest rate added to variable rate (as a percent) 1.00%            
Revolving credit facility | First option              
Credit Facilities              
Fixed interest rate base (as a percent) 2.25%            
Additional interest margin added to fixed and variable rates (as a percent) 2.00%            
Revolving credit facility | Second option              
Credit Facilities              
Fixed interest rate base (as a percent) 1.25%            
Additional interest margin added to fixed and variable rates (as a percent) 3.00%