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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)
 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2013
GBP (£)
Dec. 31, 2012
USD ($)
Dec. 31, 2012
GBP (£)
Dec. 31, 2011
USD ($)
Supplemental Schedule of Noncash Investing and Financing Activities          
Cash dividends declared, but not yet paid $ 2,600,000   $ 2,700,000   $ 2,700,000
Capital expenditure accrual 1,800,000        
Reduction in net assets (44,200,000)        
Reduction in noncontrolling interest equity 25,574,000        
Increase in other investments 25,600,000        
Portion of equity awards granted that was previously recorded in accrued expenses and other current liabilities     2,700,000    
Promissory notes issued for acquisition 3,000,000   7,200,000   9,000,000
Equity issued for acquisition         27,500,000
Reduction in promissory note payable related to a purchase price adjustment         1,400,000
Current liability and other investments recorded related to contingent consideration 2,800,000 2,000,000 16,300,000 10,000,000  
Aggregate amount of contingent consideration paid 19,100,000 12,000,000      
Assets acquired, net of cash 77,164,000   366,230,000   208,419,000
Liabilities assumed $ 36,765,000   $ 151,816,000   $ 54,296,000