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Discontinued Operations - Changes in Future Remaining Lease Obligations Discontinued Operations (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Discontinued Operations And Disposal Groups [Abstract]      
Balance, Beginning of Period $ 6,301 $ 14,474 $ 21,751
Charges Incurred [1] (141) 818 4,090
Net Cash Payments [2] (5,675) (8,991) (11,367)
Balance, End of Period $ 485 $ 6,301 $ 14,474
[1] Includes subsequent adjustments for accretion, revised estimates, and variances between estimated and actual charges, net of any reversals for terminated lease obligations.
[2] See Note 8 “Leases” for the future minimum lease payments under operating leases for discontinued operations as of December 31, 2018.