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Long-Term Debt (Amended and Restated Senior Credit Facility) - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 21, 2020
Feb. 27, 2019
Feb. 06, 2019
Dec. 15, 2015
Dec. 31, 2012
Apr. 01, 2011
May 31, 2020
Apr. 30, 2020
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2017
Dec. 15, 2014
Debt Instrument [Line Items]                                
Borrowings on revolving credit facility                         $ 100,000 $ 76,573    
Consolidated funded debt, unrestricted and unencumbered cash to consolidated EBITDA                               $ 50,000
Eurodollar [Member]                                
Debt Instrument [Line Items]                                
Interest on borrowings                         2.50%      
Base Rate Loans [Member]                                
Debt Instrument [Line Items]                                
Interest on borrowings                         1.50%      
Tranche B-3 Facility [Member] | Eurodollar [Member]                                
Debt Instrument [Line Items]                                
Interest on borrowings                         2.50%      
Basis spread on variable rate                         1.00%      
Tranche B-3 Facility [Member] | Base Rate Loans [Member]                                
Debt Instrument [Line Items]                                
Interest on borrowings                         1.50%      
Basis spread on variable rate                         0.50%      
Tranche B-3 Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                                
Debt Instrument [Line Items]                                
Interest on borrowings                         2.50%      
Amended and Restated Senior Credit Facility [Member]                                
Debt Instrument [Line Items]                                
Date entered into an agreement         Dec. 31, 2012 Apr. 01, 2011                    
Amount available under revolving line of credit                         $ 485,600      
Borrowings on revolving credit facility               $ 100,000                
Repayment of revolving credit facility             $ 100,000                  
Debt instrument maturity date       Nov. 30, 2021                     Feb. 11, 2022  
Term loan repayments                       $ 1,200        
Amended and Restated Senior Credit Facility [Member] | Eurodollar [Member]                                
Debt Instrument [Line Items]                                
Basis spread on variable rate                         1.00%      
Amended and Restated Senior Credit Facility [Member] | Base Rate Loans [Member]                                
Debt Instrument [Line Items]                                
Basis spread on variable rate                         0.50%      
Amended and Restated Senior Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                                
Debt Instrument [Line Items]                                
Interest on borrowings                         2.50%      
Amended and Restated Senior Credit Facility [Member] | Tranche B-3 Facility [Member]                                
Debt Instrument [Line Items]                                
Term loan repayments                             $ 447,300  
Amended and Restated Senior Credit Facility [Member] | Tranche B-4 Facilities [Member]                                
Debt Instrument [Line Items]                                
Debt instrument maturity date                         Feb. 16, 2023      
Term loan repayments                         $ 854,400      
Amended and Restated Senior Credit Facility [Member] | Tranche B-4 Facilities [Member] | Eurodollar [Member]                                
Debt Instrument [Line Items]                                
Interest on borrowings                         2.50%      
Basis spread on variable rate                         1.00%      
Amended and Restated Senior Credit Facility [Member] | Tranche B-4 Facilities [Member] | Base Rate Loans [Member]                                
Debt Instrument [Line Items]                                
Interest on borrowings                         1.50%      
Basis spread on variable rate                         0.50%      
Amended and Restated Senior Credit Facility [Member] | Tranche B-4 Facilities [Member] | London Interbank Offered Rate (LIBOR) [Member]                                
Debt Instrument [Line Items]                                
Interest on borrowings                         2.50%      
Amended and Restated Senior Credit Facility [Member] | September 30, 2020 to December 31, 2020 [Member]                                
Debt Instrument [Line Items]                                
Term loan principal repayments       $ 7,100                        
Term loan repayments                 $ 1,200              
Amended and Restated Senior Credit Facility [Member] | March 31, 2021 to September 30, 2021 [Member]                                
Debt Instrument [Line Items]                                
Term loan principal repayments       $ 9,500                        
Amended and Restated Senior Credit Facility [Member] | March 31, 2019 to December 31, 2019 [Member]                                
Debt Instrument [Line Items]                                
Term loan repayments                     $ 1,200          
Amended and Restated Senior Credit Facility [Member] | September 30, 2015 to December 31, 2015 [Member]                                
Debt Instrument [Line Items]                                
Term loan repayments                   $ 1,200            
Amended and Restated Senior Credit Facility [Member] | Standby Letters Of Credit [Member]                                
Debt Instrument [Line Items]                                
Standby letters of credit outstanding                         $ 14,400      
Amended and Restated Senior Credit Facility [Member] | TLB Facility Due on February 16, 2023 [Member]                                
Debt Instrument [Line Items]                                
Term loan repayments                       $ 2,300        
Amended and Restated Senior Credit Facility [Member] | TLB Facility Due on February 16, 2023 [Member] | September 30, 2020 to December 31, 2020 [Member]                                
Debt Instrument [Line Items]                                
Term loan repayments                 $ 2,300              
Amended and Restated Senior Credit Facility [Member] | TLB Facility Due on February 16, 2023 [Member] | March 31, 2019 to December 31, 2019 [Member]                                
Debt Instrument [Line Items]                                
Term loan repayments                     $ 2,300          
Amended and Restated Senior Credit Facility [Member] | TLB Facility Due on February 16, 2023 [Member] | September 30, 2015 to December 31, 2015 [Member]                                
Debt Instrument [Line Items]                                
Term loan repayments                   $ 2,300            
Eleventh Amendment [Member]                                
Debt Instrument [Line Items]                                
Date entered into an agreement     Feb. 06, 2019                          
Twelfth Amendment [Member]                                
Debt Instrument [Line Items]                                
Date entered into an agreement   Feb. 27, 2019                            
Thirteenth Amendment [Member]                                
Debt Instrument [Line Items]                                
Date entered into an agreement Apr. 21, 2020