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Discontinued Operations - Changes in Future Remaining Lease Obligations Discontinued Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Discontinued Operations And Disposal Groups [Abstract]        
Balance, Beginning of Period $ 12,120 $ 17,669 $ 14,474 $ 21,751
Charges Incurred [1] 153 743 518 401
Net Cash Payments (2,575) (2,263) (5,294) (6,003)
Balance, End of Period $ 9,698 $ 16,149 $ 9,698 $ 16,149
[1] Includes subsequent adjustments for accretion, revised estimates and variances between estimated and actual charges, net of any reversals for terminated lease obligations.