Real Estate - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended			1 Months Ended
	Dec. 31, 2007 Building	Mar. 31, 2014 RenewalOptions	Mar. 31, 2013	Dec. 31, 2008	Sep. 30, 2012 Sublease	Aug. 31, 2012 Sublease sqft	Dec. 31, 2010 Sublease sqft	Sep. 30, 2011 Second Sublease sqft	Dec. 31, 2012 Third Sublease	Nov. 30, 2012 Third Sublease sqft
Real Estate Properties [Line Items]
Sale of facility and associated real property	$ 109,000,000
Mortgage debt retired	47,700,000
Cash received net of transaction costs and debt retirement	61,000,000
Leaseback transaction lease period	12 years
Number of building leased	2
Net deferred gain on real estate sale		20,100,000		39,100,000
Deferred gain recognized on real estate sale		800,000	800,000
Lease expiration year			2019
Percentage of management fee included in the base annual rent		3.50%
Letter of credit		4,200,000
Lease extension period		10 years
Number of times to renew the lease contract		2
Subleased area						17,000	16,000	3,300		14,000
Rental income from sublease agreement							600,000	100,000		500,000
Sublease agreement period							3 years	3 years		3 years 6 months
Lease renewal additional periods							1 year	1 year		1 year
Cease-use expense						150,000	2,500,000	300,000		1,200,000
Deferred rent reversed					$ 15,000		$ 173,000	$ 47,000	$ 250,000