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Long-term Debt - Schedule of Long-term Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Jun. 30, 2016
Debt Instrument [Line Items]    
Principal amount of long-term debt $ 1,374,341 $ 1,472,833
Less unamortized debt issuance costs (14,537) (16,789)
Total long-term debt 1,359,804 1,456,044
Less current portion (67,456) (53,965)
Long-term debt, net of current portion 1,292,348 1,402,079
Bank credit facility - term loans    
Debt Instrument [Line Items]    
Principal amount of long-term debt 1,019,341 1,032,833
Bank credit facility - revolver loans    
Debt Instrument [Line Items]    
Principal amount of long-term debt $ 355,000 $ 440,000