Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.19.3.a.u2
Summary of Significant Accounting Policies - Additional Information (Detail)
12 Months Ended
Dec. 31, 2019
Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Lessee, Operating Lease, Term of Contract 5 years
Maximum [Member] | Gathering systems  
Property, Plant and Equipment [Line Items]  
Useful life 20 years
Maximum [Member] | Other property and equipment  
Property, Plant and Equipment [Line Items]  
Useful life 20 years
Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Lessee, Operating Lease, Term of Contract 2 years
Minimum [Member] | Gathering systems  
Property, Plant and Equipment [Line Items]  
Useful life 15 years
Minimum [Member] | Other property and equipment  
Property, Plant and Equipment [Line Items]  
Useful life 3 years