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Leases - Schedule of Components of Lease Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Lessee Lease Description [Line Items]    
Operating lease cost $ 3,208 $ 6,288
Variable lease expense [1] 1,203 2,354
Short-term lease expense / costs [2] 687 1,170
Sublease income (873) (1,748)
Total lease expense 4,225 8,064
Natural Gas and Oil Properties    
Lessee Lease Description [Line Items]    
Short-term lease expense / costs [3] $ 8,319 $ 17,093
[1] Variable lease payments that are not dependent on an index or rate are not included in the lease liability or ROU assets.
[2] Short-term lease expense represents expense related to leases with a contract term of one year or less.
[3] These short-term lease costs are related to leases with a contract term of one year or less and the majority of which are related to drilling rigs and are capitalized as part of natural gas and oil properties on our balance sheets