Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income	$ 4,566	$ 5,406	$ 10,616	$ 14,391
Other comprehensive income:
Foreign currency translation adjustments	1,985	3,143	(1,705)	2,897
Total comprehensive income	6,551	8,549	8,911	17,288
Less: Comprehensive income attributable to the noncontrolling interest	26	112	146	312
Total comprehensive income attributable to CDI	$ 6,525	$ 8,437	$ 8,765	$ 16,976