Lease Exit and Related Charges (Changes to Accrued Loss on Excess Office Facilities) (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Accrued Loss on Excess Office Facilities [Roll Forward]
Accrued loss at December 31, 2015	$ 2,595
Additions and adjustments to the lease loss accrual, including estimated sublease income	2,287
Less amounts paid, net of sublease amounts	(1,257)
Accrued loss at September 30, 2016	3,625
Less current portion (included in Accrued and other current liabilities)	(1,824)
Accrued loss, non-current portion (included in Other long term liabilities)	$ 1,801