Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income	$ 3,497	$ 5,071	$ 6,050	$ 8,985
Other comprehensive income:
Foreign currency translation adjustments	(1,519)	(1,637)	(3,690)	(246)
Total comprehensive income	1,978	3,434	2,360	8,739
Less: Comprehensive income attributable to the noncontrolling interest	10	64	120	200
Total comprehensive income attributable to CDI	$ 1,968	$ 3,370	$ 2,240	$ 8,539