Discontinued Operations - Changes in Future Remaining Lease Obligations Discontinued Operations (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Discontinued Operations And Disposal Groups [Abstract]
Balance, Beginning of Period		$ 21,751	$ 37,616
Charges Incurred	[1]	(342)	(570)
Net Cash Payments		(3,740)	(5,441)
Other		0	0
Balance, End of Period		$ 17,669	$ 31,605

[1] Includes charges for newly vacated spaces and subsequent adjustments for accretion, revised estimates and variances between estimated and actual charges, net of any reversals for terminated lease obligations.