Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2016		Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Current	$ 3,888
Derivative Asset, Current	446		$ 97,956
Liabilities:
Derivative Liability, Noncurrent	(11,291)		0
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long Term Investments Fair Value Disclosure	4,292	[1]	4,123
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long Term Investments Fair Value Disclosure	4,292	[1]	4,123
Liabilities:
Deferred Compensation Plan Liabilities Fair Value Disclosure			4,125
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long Term Investments Fair Value Disclosure	0		0
Liabilities:
Deferred Compensation Plan Liabilities Fair Value Disclosure			0
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long Term Investments Fair Value Disclosure	0		0
Liabilities:
Deferred Compensation Plan Liabilities Fair Value Disclosure			0
Fair Value, Measurements, Recurring | Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Current	3,888
Derivative Asset, Current	446		97,956
Liabilities:
Derivative Liability, Noncurrent	(11,291)
Fair Value, Measurements, Recurring | Commodity contracts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Current	0
Derivative Asset, Current	0		0
Liabilities:
Derivative Liability, Noncurrent	0
Fair Value, Measurements, Recurring | Commodity contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Current	3,888
Derivative Asset, Current	446		97,956
Liabilities:
Derivative Liability, Noncurrent	(11,291)
Fair Value, Measurements, Recurring | Commodity contracts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Current	0
Derivative Asset, Current	0		0
Liabilities:
Derivative Liability, Noncurrent	$ 0
Predecessor [Member] | Fair Value, Measurements, Recurring
Liabilities:
Deferred Compensation Plan Liabilities Fair Value Disclosure			$ 4,125

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