Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income (loss)	$ 19,433	$ 15,000	$ (10,814)
Other comprehensive income (loss):
Foreign currency translation adjustments	1,843	(473)	1,955
Total comprehensive income (loss)	21,276	14,527	(8,859)
Less: Comprehensive income attributable to the noncontrolling interest	353	111	64
Total comprehensive income (loss) attributable to CDI	$ 20,923	$ 14,416	$ (8,923)