Description of Business and Summary of Significant Accounting Policies - Fair Value Reporting (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets measured at fair value	$ 1,458	[1]
Total liabilities measured at fair value	22,021	[1],[2]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation:
Beginning balance	7,590
(Gains) or losses included in earnings	104	[3]
Foreign currency translation adjustments	(309)	[4]
Business acquisitions	15,568
Settlements	(2,046)
Ending balance	20,907	[5]
Put Option [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	1,114	[1],[6]
Foreign Exchange Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	0	[1],[7]
Contingent Accrued Earn-out Acquisition Consideration [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	20,907	[1],[2]
Certificates of Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	1,458	[1]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets measured at fair value	1,458	[1]
Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	1,458	[1]
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total liabilities measured at fair value	1,114
Fair Value, Inputs, Level 2 [Member] | Put Option [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	1,114	[1],[6]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total liabilities measured at fair value	20,907	[1],[2]
Fair Value, Inputs, Level 3 [Member] | Contingent Accrued Earn-out Acquisition Consideration [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	20,907	[1],[2]
Accounts Payable and Accrued Liabilities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation:
Ending balance	$ 5,840	[5]

[1] During the six months ended June 30, 2012 there were no transfers between fair value levels 1, 2, or 3.

[2] The income valuation approach is applied and the valuation inputs include the contingent payment arrangement terms, projected cash flows, rate of return, and probability assessments.

[3] Recorded as an adjustment to reported general and administrative expenses

[4] Recorded as a component of other comprehensive income within stockholders' equity

[5] Short term position of $5.84 million is recorded in Accounts payable and accrued liabilities in the currently liability section of the Condensed Consolidated Balance Sheets

[6] The market valuation approach is applied and the valuation inputs include foreign currency exchange spot rates, forward premiums, forward foreign currency exchange rates, term, and maturity date.

[7] The income valuation approach is applied and the valuation inputs include the contingent payment arrangement terms, projected cash flows, rate of return, and the probability assessments.