International Business Machines Corporation Information Technology Outsourcing Agreement - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2009	Dec. 31, 2011	Dec. 31, 2010	Mar. 17, 2008 Outsourcing Agreement	Dec. 31, 2011 Transition Services
Information Technology Outsourcing Agreement [Line Items]
Initial term of outsourcing agreement with IBM				7 years
Expected IT services fees and project costs				$ 116,000,000
Transition services completion period				21 months
Transition services cost, recognized	6,700,000
Transition services expense	100,000
Payment for transition services cost	5,100,000
Datacenter moving costs	200,000
Other noncurrent liabilities		12,534,000	23,430,000		200,000
Accrued and other current liabilities		$ 23,481,000	$ 24,293,000		$ 1,400,000