Discontinued Operations - Changes in Future Remaining Lease Obligations Discontinued Operations (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Discontinued Operations And Disposal Groups [Abstract]
Balance, Beginning of Period		$ 21,751	$ 37,616	$ 44,084
Charges Incurred	[1]	4,090	(342)	13,676
Net Cash Payments	[2]	(11,367)	(15,523)	(24,854)
Other	[3]			4,710
Balance, End of Period		$ 14,474	$ 21,751	$ 37,616

[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 7 “Leases” for the future minimum lease payments under operating leases for discontinued operations as of December 31, 2016.

[3] Includes existing prepaid rent and deferred rent liability balances for newly vacated spaces that are netted with the losses incurred in the period recorded.