Registration of securities issued in business combination transactions

Fair Value Measurements - Assets and Liabilities Measured on a Nonrecurring Basis (Detail)

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Fair Value Measurements - Assets and Liabilities Measured on a Nonrecurring Basis (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Sep. 30, 2016
Mar. 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Impairment of proved oil and gas properties         $ 17,400
Exploration impairment cost       $ 0 $ 20
One Stone Exchange Agreement          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Asset impairment charges $ 11,300 $ 11,300   $ 11,300  
Impairment of proved oil and gas properties 7,800   $ 7,800    
Accounts receivable impairment charges     100    
Exploration impairment cost $ 3,400   $ 3,400