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Discontinued Operations - Changes in Future Remaining Lease Obligations Discontinued Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Discontinued Operations And Disposal Groups [Abstract]        
Balance, Beginning of Period $ 9,698 $ 16,149 $ 14,474 $ 21,751
Charges Incurred [1] 251 (479) 769 (78)
Net Cash Payments (1,538) (3,049) (6,832) (9,052)
Balance, End of Period $ 8,411 $ 12,621 $ 8,411 $ 12,621
[1] Includes subsequent adjustments for accretion, revised estimates and variances between estimated and actual charges, net of any reversals for terminated lease obligations.