Investment Activity in Joint Venture in IP Services Operating Segment (Detail) (IP Services, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
IP Services
Schedule of Equity Method Investments [Line Items]
Beginning Balance	$ 2,265	$ 1,804
Proportional share of net income	476	396
Unrealized foreign currency translation gain, net	195	65
Ending Balance	$ 2,936	$ 2,265