Acquisitions and Investment - Unaudited Pro Forma Information Presents Consolidated Results of Operations (Detail) (Scient'x [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Scient'x [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Revenues	$ 197,711	$ 182,945
Operating loss	(23,466)	(6,892)
Net loss	$ (21,131)	$ (8,785)
Net loss per share, basic and diluted	$ (0.24)	$ (0.10)