Restatement of Previously Issued Financial Statements (Condensed consolidated statements of (loss) income, including balances originally reported, corrections and restated balances (Detail 1) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended
	Mar. 31, 2018		Mar. 31, 2017	Mar. 31, 2018		Mar. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax (benefit) provision	$ 4,948	[1]	$ 2,924	$ 19,997	[1]	$ 4,949
Net loss	$ (267,985)	[1]	$ 5,588	$ (281,395)	[1]	$ 9,409
Basic loss per common share (in dollars per share)	$ (7.59)	[1]	$ 0.16	$ (8.00)	[1]	$ 0.30
Diluted loss per common share (in dollars per share)	$ (7.59)	[1]	$ 0.16	$ (8.00)	[1]	$ 0.30
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax (benefit) provision	$ (66,402)			$ (51,353)
Net loss	$ (196,635)			$ (210,045)
Basic loss per common share (in dollars per share)	$ (5.57)			$ (5.97)
Diluted loss per common share (in dollars per share)	$ (5.57)			$ (5.97)
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income tax (benefit) provision	$ 71,350			$ 71,350
Net loss	$ (71,350)			$ (71,350)
Basic loss per common share (in dollars per share)	$ (2.02)			$ (2.03)
Diluted loss per common share (in dollars per share)	$ (2.02)			$ (2.03)

[1] (as restated)