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Summary of Significant Accounting Policies - Additional Information (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Field
$ / shares
Sep. 30, 2016
$ / shares
Jun. 30, 2016
$ / shares
Mar. 31, 2016
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Sep. 30, 2015
$ / shares
Jun. 30, 2015
$ / shares
Mar. 31, 2015
$ / shares
Dec. 31, 2016
USD ($)
Customer
Field
Segment
$ / shares
Dec. 31, 2015
USD ($)
Customer
$ / shares
Dec. 31, 2014
USD ($)
Customer
$ / shares
Summary Of Significant Accounting Policies [Line Items]                      
Accounts receivable $ 43,638       $ 27,476       $ 43,638 $ 27,476  
Capitalized interest expense                 $ 1,100 2,800 $ 9,100
Gain on reduction of pension liability                     2,208
Pension plan termination date                 2015-10    
Depreciation, depletion and amortization                 $ 92,948 244,750 89,218
Number of field included in assessment of impairment | Field 2               2    
Impairment of oil and gas properties                 $ 17,665 $ 691,334 34,855
Deferred tax liability                     97,600
Asset retirement obligations credit adjusted discount rates                 10.33% 10.33%  
Operating lease expiration year                 2024    
Number of operating segment | Segment                 1    
Prior period adjustment in cash flows                     14,800
Decrease in accounts receivable                 $ 20,563 $ (20,437) $ 33,605
Increase of net loss, per common share | $ / shares $ (0.23) $ (0.10) $ (0.33) $ (0.18) $ (3.66) $ (0.37) $ (0.19) $ (0.17) $ (0.84) $ (4.46) $ (1.27)
Decrease in accrual for production and ad valorem taxes to be paid                 $ 4,000    
Decrease of net loss, per common share | $ / shares                 $ 0.02    
Natural Gas and NGLs [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Decrease in accounts receivable                 $ (4,000)    
Increase in revenue from oil and natural gas                 1,500    
Increase in transportation, gathering and compression expense                 5,800    
Increase in net loss                 $ 4,000    
Increase of net loss, per common share | $ / shares                 $ 0.02    
Eclipse I [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Ownership percentage                     100.00%
Eclipse Resources Ohio LLC [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Ownership percentage                     100.00%
Eclipse Resources Operating, LLC ("Eclipse Operating") [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Ownership percentage                     100.00%
Oil and Gas Properties [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Depreciation, depletion and amortization                 $ 91,000 $ 242,900 $ 88,400
Other property and equipment [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Depreciation                 $ 1,900 1,800 800
Other property and equipment [Member] | Minimum [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Property and equipment, expected lives                 5 years    
Other property and equipment [Member] | Maximum [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Property and equipment, expected lives                 40 years    
Proved Oil And Gas Properties [Member] | Utica Shale [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Impairment of oil and gas properties                 $ 17,700 691,300 34,900
Conventional Properties [Member] | Utica Shale [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Impairment of oil and gas properties                     30,900
Unproved Oil And Gas Properties [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Impairment of oil and gas properties                 29,800 95,600 $ 5,700
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Fair value of commodity derivative contracts $ (48,100)       $ 34,441       $ (48,100) $ 34,441  
Sales Revenue, Net [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Number of customers | Customer                 4 4 2
Unbilled Revenues [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Accounts receivable $ 41,400       $ 19,900       $ 41,400 $ 19,900