Summary of Significant Accounting Policies - Additional Information (Detail)	1 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) Derivative	Dec. 31, 2014 USD ($) Derivative	Dec. 31, 2013 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Natural gas property, acquisition cost incurred		$ 0
Assets held for sale		0	$ 0
Non-cash impairment charges		43,188,000
Carrying value of capitalized software		19,900,000	13,100,000
Capitalized software, net of accumulated amortization		2,100,000	500,000
Interest cost capitalized		30,600,000	14,100,000	$ 4,000,000
Impairments of goodwill		0	$ 0	0
Insurance coverage of general liability and auto liability risks		100,000,000
Insurance policy covering pollution liability		$ 50,000,000
Tax benefit recognized		Greater than 50%
Number of derivatives held with fair value eligible for offset | Derivative		0	0
Debt issuance costs		$ 6,400,000
Chemical [Member]
Summary Of Significant Accounting Policies [Line Items]
Non-cash impairment charges		43,200,000
Fair value of natural gas properties		$ 22,500,000
Anticipated cash flows discount rate		10.00%
Chemical [Member] | Pryor Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Non-cash impairment charges		$ 3,500,000
Chemical [Member] | Marcellus Shale Region [Member]
Summary Of Significant Accounting Policies [Line Items]
Non-cash impairment charges	$ 39,700,000	39,700,000
Fair value of natural gas properties	$ 22,500,000
Natural Gas Development Costs [Member]
Summary Of Significant Accounting Policies [Line Items]
Natural gas, development cost incurred		$ 6,200,000
Capitalized Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of the software		8 years
Interest cost capitalized		$ 300,000	$ 500,000	$ 100,000
Amortization expense		1,200,000	$ 400,000
Estimated amortization related to capitalized software, 2016		1,800,000
Estimated amortization related to capitalized software, 2017		2,600,000
Estimated amortization related to capitalized software, 2018		3,200,000
Estimated amortization related to capitalized software, 2019		3,200,000
Estimated amortization related to capitalized software, 2020		$ 3,200,000
Short-Term Investments [Member]
Summary Of Significant Accounting Policies [Line Items]
Original maturity period		26 weeks
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership interest in equity method investment		20.00%
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership interest in equity method investment		50.00%