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Leases - Additional Information (Detail)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
 [1]
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
 [2]
Dec. 31, 2020
USD ($)
Facility
OperatingEquipment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Lessee Lease Description [Line Items]            
Operating leasing arrangements initial term   58 months     58 months  
Proceeds from sale of facility   $ 10,200        
Gain on sale of facility $ 7,314   $ 162,581 $ 3,079 $ 13,904 $ 28,958
Right of use asset   31,275   16,850 $ 31,275  
Operating lease liabilities       $ 26,214    
New Facility Lease            
Lessee Lease Description [Line Items]            
Number of facility leases | Facility       2    
Right of use asset       $ 1,500    
Operating lease liabilities       $ 1,500    
Extended Facility Lease            
Lessee Lease Description [Line Items]            
Number of facility leases | Facility       2    
Right of use asset       $ 200    
Operating lease liabilities       $ 200    
Terminated Lease            
Lessee Lease Description [Line Items]            
Number of facility leases | Facility       4    
Right of use asset       $ 400    
Operating lease liabilities       $ 2,200    
Number of operating equipment leases | OperatingEquipment       3    
Other Operating Expenses (Income), Net            
Lessee Lease Description [Line Items]            
Gain on sale of facility   $ 800        
Minimum            
Lessee Lease Description [Line Items]            
Operating leasing arrangements initial term       1 year    
Leases remaining lease terms       6 months    
Maximum            
Lessee Lease Description [Line Items]            
Leases remaining lease terms       8 years    
[1]

Impairment of property and equipment related to Canadian drilling operations was included in “Depreciation, depletion, amortization and impairment” in the consolidated statements of operations.
[2]

Impairment of property and equipment was included in “Depreciation, depletion, amortization and impairment” in the consolidated statements of operations.