Debt - Senior Secured Credit Facility (Detail) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended
May 08, 2012
Jul. 31, 2014
Jan. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 09, 2012
Jul. 31, 2012
Mar. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2015
Feb. 02, 2011
Jun. 30, 2010
Debt Instrument [Line Items]                            
Accrued interest on outstanding debt       $ 43,500,000 $ 48,300,000                  
Repayment of term loans         1,239,000,000 147,000,000                
Proceeds from the issuance of Senior Notes         1,325,000,000                  
Equity contribution from Parent 22,200,000         162,155,000                
Senior Secured Credit Facility first lien net leverage ratio       4.50 5.00       5.25 5.00 5.00      
Loss on extinguishment of debt   7,400,000 20,700,000 7,390,000 20,744,000                  
8.750% Senior Secured Notes [Member]                            
Debt Instrument [Line Items]                            
Proceeds from the issuance of Senior Notes     1,325,000,000                      
Debt instrument interest rate     8.75%                      
Scenario Forecast [Member]                            
Debt Instrument [Line Items]                            
Senior Secured Credit Facility first lien net leverage ratio                       4.25    
2010 Term Loans [Member]                            
Debt Instrument [Line Items]                            
Available borrowings under the senior secured term loans                         780,000,000 800,000,000
Revolving Facility [Member]                            
Debt Instrument [Line Items]                            
Maximum borrowing capacity, Revolving Credit Facility     300,000,000     240,000,000               240,000,000
Credit Facility, amount outstanding       0 0                  
Repayment of term loans     1,239,000,000                      
Capitalization of issuance costs               1,200,000            
Unamortized deferred financing fees       8,800,000 11,700,000                  
Credit Facility, funds available for borrowings       293,300,000 292,700,000                  
Letters of credit, amount outstanding       6,700,000 7,300,000                  
Interest expense excluding amortization of deferred financing fees and debt discounts       1,800,000 2,800,000 6,000,000                
Interest paid       1,900,000 2,800,000 6,100,000                
Revolving Facility [Member] | Base Rate [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, basis spread on variable rate     3.00%     4.75%                
Revolving Facility [Member] | LIBOR [Member]                            
Debt Instrument [Line Items]                            
Debt instrument, basis spread on variable rate     4.00%     5.75%                
Debt instrument, maturity date     2018-01                      
2011 Term Loans [Member]                            
Debt Instrument [Line Items]                            
Available borrowings under the senior secured term loans                         1,600,000,000  
Credit Facility, amount outstanding                         1,400,000,000  
Repayment of term loans             140,000,000              
Capitalization of issuance costs               6,200,000            
Debt issuance costs               2,300,000            
Senior Secured Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Capitalization of issuance costs     5,500,000                      
Senior Secured Credit Facility maximum leverage ratio           5.25                
Senior Secured Credit Facility minimum interest coverage ratio           2.00                
Percentage of Revolving Facility borrowing capacity covenant trigger     25.00%                      
Undrawn letters of credit     10,000,000                      
Loss on extinguishment of debt                 20,700,000          
Interest expense relating to amortization of deferred financing fees       2,900,000 3,100,000 6,500,000                
Interest expense relating to amortization of debt discounts       0 100,000 500,000                
Term Loans [Member]                            
Debt Instrument [Line Items]                            
Interest expense excluding amortization of deferred financing fees and debt discounts       0 7,700,000 91,000,000                
Interest paid       $ 0 $ 16,500,000 $ 87,600,000