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Summary of Significant Accounting Policies (Additional Information) (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 24 Months Ended
Jun. 30, 2014
USD ($)
item
$ / shares
Jan. 31, 2014
ARS / $
Jun. 30, 2015
USD ($)
$ / shares
VEF / $
Mar. 31, 2015
USD ($)
Jun. 30, 2014
USD ($)
item
$ / shares
Mar. 31, 2014
USD ($)
Jun. 30, 2015
USD ($)
$ / shares
VEF / $
Jun. 30, 2014
USD ($)
item
$ / shares
Dec. 31, 2014
USD ($)
item
Feb. 10, 2015
VEF / $
Dec. 31, 2013
ARS / $
Significant Accounting Policies [Line Items]                      
Percentage of revenues and operating costs generated in foreign operations             99.90% 99.60%      
Long-lived assets and goodwill located in the foreign operations     $ 207,000       $ 207,000   $ 170,147,000    
Exchange rate used to re-measure transactions   8.0 197.30       197.30     12 6.52
Foreign exchange loss       $ 20,400,000 $ 16,500,000            
Impairment of Long lived assets         49,496,000   $ 16,226,000 $ 49,496,000      
Percentage of increase in exchange ratio   23.00%                  
Net assets decreased           $ 14,625,000          
Recognize foreign currency gain           $ 4,597,000          
Percentage on relief of total income tax             60.00%        
Aggregate tax benefit, total         $ 1,497,000     $ 3,599,000      
Aggregate per share effect of the Argentine tax holiday | $ / shares         $ 0.03     $ 0.08      
Number of acquisitions | item                 2    
Minimum percentage of principal amount outstanding             25.00%        
Percent of principal holder of 25% of note can declare, including interest due and payable             100.00%        
Payment for capped call transactions               $ 19,668,000      
Net of deferred income tax effect amounts             $ 7,736,000 $ (8,672,000)      
SICAD 2 [Member]                      
Significant Accounting Policies [Line Items]                      
Impairment of Long lived assets         $ 49,500,000            
Venezuelan Operations [Member]                      
Significant Accounting Policies [Line Items]                      
Number of office spaces owned | item 2       2     2      
Fair value of real estate properties       9,200,000              
Impairment of Long lived assets     $ 49,500,000 $ 16,200,000              
Percentage of consolidated net assets     0.80%       0.80%        
Percentage of consolidated cash and investments     1.10%       1.10%        
2.25% Convertible Senior Notes Due 2019 [Member]                      
Significant Accounting Policies [Line Items]                      
Convertible senior notes, issued $ 330,000,000   $ 330,000,000   $ 330,000,000   $ 330,000,000 $ 330,000,000 $ 330,000,000    
Convertible senior notes, interest rate 2.25%       2.25%     2.25%      
Convertible senior notes, maturity date Jul. 01, 2019                    
Convertible senior notes, conversion rate 7.9353%                    
Convertible senior notes, conversion price | $ / shares $ 126.02       $ 126.02     $ 126.02      
Convertible senior notes, principal amount per share $ 1,000                    
Carrying value of the permanent equity component reported in additional paid-in-capital             46,985,000        
Net carrying amount     $ 283,015,000       $ 283,015,000        
Cash flows, discount rate             5.55%        
Effective interest rate     6.10%       6.10%        
2.25% Convertible Senior Notes Due 2019 [Member] | Capped Call Transactions [Member]                      
Significant Accounting Policies [Line Items]                      
Payment for capped call transactions               $ 19,668,000      
Strike price, per share | $ / shares             $ 126.02        
Approximate cap price, per share | $ / shares     $ 155.78       $ 155.78        
Net of deferred income tax effect amounts             $ 12,784,000