Lease Exit and Related Charges (Changes to Accrued Loss on Excess Office Facilities) (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Disclosure Changes To Accrued Loss On Excess Office Facilities [Abstract]
Accrued loss as of December 31, 2013	$ 254
Additions and adjustments to the lease exit charges accrual, including sublease income estimate revision	480
Less amounts paid, net of sublease amounts	(611)
Accrued loss as of September 30, 2014 (included in Accrued and other current liabilities)	$ 123