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Long-Term Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Aug. 02, 2016
Debt Instrument [Line Items]        
Revolving Credit Facility $ 485,000 $ 560,000 $ 485,000  
Total Debt 1,500,000 1,575,000    
Less: Debt Origination Costs (7,912) (7,685)    
Long-term Debt 1,492,088 1,567,315    
4.500% Senior Unsecured Notes Due 2026 [Member]        
Debt Instrument [Line Items]        
Total Debt 350,000 350,000   $ 350,000
Term Loan [Member]        
Debt Instrument [Line Items]        
Total Debt $ 665,000 $ 665,000