Discontinued Operations - Changes in Future Remaining Lease Obligations Discontinued Operations (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Discontinued Operations And Disposal Groups [Abstract]
Balance, Beginning of Period		$ 16,149	$ 27,993	$ 21,751	$ 37,616
Charges Incurred	[1]	(479)	(151)	(78)	(564)
Net Cash Payments		(3,049)	(3,275)	(9,052)	(12,485)
Other		0	50	0	50
Balance, End of Period		$ 12,621	$ 24,617	$ 12,621	$ 24,617

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