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Foreign Currency Translation (Details)
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2012
USD ($)
Mar. 31, 2011
USD ($)
Dec. 31, 2011
USD ($)
Mar. 31, 2012
Brazilian Subsidiaries [Member]
USD ($)
Mar. 31, 2012
Brazilian Subsidiaries [Member]
BRL
Dec. 31, 2011
Brazilian Subsidiaries [Member]
BRL
Mar. 31, 2012
Mexican Subsidiaries [Member]
USD ($)
Mar. 31, 2012
Mexican Subsidiaries [Member]
MXN
Dec. 31, 2011
Mexican Subsidiaries [Member]
MXN
Mar. 31, 2012
Chilean Subsidiaries [Member]
USD ($)
Mar. 31, 2012
Chilean Subsidiaries [Member]
CLP
Dec. 31, 2011
Chilean Subsidiaries [Member]
CLP
Mar. 31, 2012
Other Subsidiaries [Member]
USD ($)
Mar. 31, 2012
Argentinean Subsidiaries [Member]
USD ($)
Mar. 31, 2012
Argentinean Subsidiaries [Member]
ARS
Dec. 31, 2011
Argentinean Subsidiaries [Member]
ARS
Mar. 31, 2012
Colombian Subsidiaries [Member]
USD ($)
Mar. 31, 2012
Colombian Subsidiaries [Member]
COP
Dec. 31, 2011
Colombian Subsidiaries [Member]
COP
Foreign Currency Translation (Textual) [Abstract]                                      
Accumulated other comprehensive loss $ 1,846,000   $ 23,682,000                                
Cumulative foreign currency adjustments 4,564,000   (11,325,000)                                
Currency exchange rate with US Dollar         1.83 1.87   12.80 14.00   486.50 520.70     4.38 4.31   1,781.60 1,950.00
Accumulated Other Comprehensive (Loss), Foreign Currency Translation Adjustment 15,799,000 7,350,000   5,065,000     6,939,000     2,286,000     744,000 (1,622,000)     2,477,000    
Total assets of the company's subsidiaries $ 3,574,703,000   $ 3,522,408,000 $ 322,708,000     $ 131,499,000     $ 41,681,000       $ 128,452,000     $ 37,941,000