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Long-Term Debt - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
May 25, 2017
May 18, 2017
Sep. 16, 2016
Jul. 29, 2016
Apr. 01, 2016
Jul. 14, 2015
Jun. 26, 2015
Jun. 17, 2015
Mar. 25, 2015
Mar. 13, 2015
Feb. 21, 2014
Apr. 30, 2013
Sep. 30, 2017
Oct. 01, 2016
Sep. 27, 2014
Jun. 29, 2013
Sep. 30, 2017
Oct. 01, 2016
Dec. 31, 2016
Jun. 30, 2018
May 24, 2017
Jun. 22, 2015
Mar. 20, 2015
Sep. 26, 2014
Apr. 02, 2013
Debt Instrument                                                  
Payments of term loan                       $ 2,399,904,000         $ 88,387,000 $ 160,073,000              
Fees incurred in connection with debt refinancing                               $ 44,817,000                  
Gain on early extinguishment of debt                         $ 0 $ 0   $ 21,685,000 1,554,000 $ 0              
Credit facility drew down amount           $ 48,000,000                                      
Credit Facility, aggregate principal amount outstanding                         $ 1,930,386,000       $ 1,930,386,000   $ 2,021,250,000            
Additional applicable margin in the event the Company receives a corporate rating of BB- from S&P (or lower) and a corporate rating of Ba3 from Moody's (or lower)                         0.25%       0.25%                
Average interest rate on outstanding debt, exclusive the impact of swap                         4.68%       4.68%   4.41%            
Average interest rate on outstanding debt, including the impact of swap                                 5.19%   5.32%            
Scenario, Forecast                                                  
Debt Instrument                                                  
Cash flow sweep obligation                                       $ 11,216,000          
Tranche B-1 Term Facility due April 2, 2016                                                  
Debt Instrument                                                  
WWI Credit Facility, maximum borrowing capacity                                                 $ 300,000,000
Fees incurred in connection with debt refinancing             $ 641,000   $ 601,000                                
Gain on early extinguishment of debt             6,677,000   4,749,000                                
Prepayment of accepted offers             77,225,000   57,389,000                                
Accrued and unpaid interest on the amount to be prepaid             84,862,000   63,065,000                                
Reduction in obligation                 59,728,000                                
Debt instrument, voluntary prepayment                 2,500,000                                
Write-off of deferred financing fees             $ 321,000   $ 326,000                                
Principal amount paid on term loan         $ 144,323,000                                        
Credit Facility, aggregate principal amount outstanding                         $ 0       $ 0   $ 0            
Tranche B-1 Term Facility due April 2, 2016 | London Interbank Offered Rate (LIBOR)                                                  
Debt Instrument                                                  
WWI Credit Facility, additional interest rate                     2.75%           3.00%                
Tranche B-1 Term Facility due April 2, 2016 | Maximum                                                  
Debt Instrument                                                  
Aggregate principal amount, discount par value               $ 229,000,000   $ 75,000,000                              
Tranche B-1 Term Facility due April 2, 2016 | Minimum                                                  
Debt Instrument                                                  
Debt instrument, interest rate, effective percentage                                           9.00% 9.00%    
Tranche B-2 Term Facility due April 2, 2020                                                  
Debt Instrument                                                  
WWI Credit Facility, maximum borrowing capacity                                                 2,100,000,000
Fees incurred in connection with debt refinancing $ 305,000                                                
Gain on early extinguishment of debt 1,554,000                                                
Prepayment of accepted offers 73,030,000                                                
Accrued and unpaid interest on the amount to be prepaid 75,507,000                                                
Write-off of deferred financing fees $ 618,000                                                
Credit Facility, aggregate principal amount outstanding                         $ 1,930,386,000       $ 1,930,386,000   2,021,250,000            
Tranche B-2 Term Facility due April 2, 2020 | London Interbank Offered Rate (LIBOR)                                                  
Debt Instrument                                                  
WWI Credit Facility, additional interest rate                     3.00%           3.25%                
Tranche B-2 Term Facility due April 2, 2020 | Maximum                                                  
Debt Instrument                                                  
Aggregate principal amount, discount par value   $ 75,000,000                                              
Tranche B-2 Term Facility due April 2, 2020 | Minimum                                                  
Debt Instrument                                                  
Debt instrument, interest rate, effective percentage                                         3.28%        
Tranche B-2 Term Facility due April 2, 2020 | Minimum | London Interbank Offered Rate (LIBOR)                                                  
Debt Instrument                                                  
WWI Credit Facility, interest rate                         0.75%       0.75%                
Tranche B-2 Term Facility due April 2, 2020 | Minimum | Base Rate Plus                                                  
Debt Instrument                                                  
WWI Credit Facility, interest rate                         1.75%       1.75%                
Term B Loan due January 26, 2014                                                  
Debt Instrument                                                  
Payments of term loan                       128,759,000                          
Term C Loan due June 30, 2015                                                  
Debt Instrument                                                  
Payments of term loan                       110,602,000                          
Term D Loan due June 30, 2016                                                  
Debt Instrument                                                  
Payments of term loan                       117,612,000                          
Term E Loan due March 15, 2017                                                  
Debt Instrument                                                  
Payments of term loan                       1,125,044,000                          
Term F Loan due March 15, 2019                                                  
Debt Instrument                                                  
Payments of term loan                       817,887,000                          
Revolver A-1 Loan due June 30, 2014                                                  
Debt Instrument                                                  
Payments of term loan                       21,247,000                          
Revolver A-2 Loan due March 15, 2017                                                  
Debt Instrument                                                  
Payments of term loan                       $ 78,753,000                          
Term Loan Facility                                                  
Debt Instrument                                                  
Debt outstanding amount                         $ 1,916,271,000       $ 1,916,271,000   2,002,299,000           2,400,000,000
Revolving Facility due April 2, 2018                                                  
Debt Instrument                                                  
WWI Credit Facility, maximum borrowing capacity                                               $ 50,000,000 250,000,000
Credit facility available amount                         47,835,000       47,835,000               $ 248,848,000
Write-off of deferred financing fees related to amendment                             $ 1,583,000                    
Principal amount paid on revolving facility     $ 23,000,000 $ 25,000,000                                          
Loan outstanding under the revolving facility       $ 48,000,000                 0       0                
Line of credit facility, issued but undrawn letters of credit                         2,165,000       2,165,000                
Credit Facility, aggregate principal amount outstanding                         $ 0       $ 0   $ 0            
Revolving credit facility, commitment fee on unused commitments                                 0.50%   0.50%            
Customary letter of credit fees and fronting fees                                 $ 183,000   $ 31,000            
Revolving credit facility, commitment fee amount                                 $ 36,000   $ 49,000            
Revolving Facility due April 2, 2018 | London Interbank Offered Rate (LIBOR)                                                  
Debt Instrument                                                  
WWI Credit Facility, additional interest rate                                 2.50%