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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
American Taxpayer Relief Act of 2012 [Member]
Dec. 31, 2013
Israeli Tax [Member]
Dec. 31, 2012
Israeli Tax [Member]
Dec. 31, 2014
Scenario, Plan [Member]
Israeli Tax [Member]
Dec. 31, 2013
2015 [Member]
Income Taxes [Line Items]                  
Gross Massachusetts tax research other tax credit carryforwards $ 8,689                
Tax credit expiration period 2028                
U.S. Federal capital loss carryforwards                 59,275
Gross unrecognized tax benefits excluding interest and penalties 47,684 40,674 36,540 22,028          
Net unrecognized tax benefit excluding interest and penalties that would impact effective tax rate 24,758                
Net benefit to income tax expense, excluding interest and penalties, due to discrete reserve releases 140   2,148            
Accrued interest on unrecognized tax benefits 2,159 1,571 973            
Unrecognized tax benefits related to various U.S.federal, state and foreign tax positions 12,614                
Increased valuation allowance 395 1,022 1,208            
Undistributed earnings in foreign subsidiaries 440,841                
Tax holiday resulted in income tax savings     $ 1,000 $ 2,700          
Income tax holiday tax rate           7.00% 10.00% 9.00%  
Reduction in effective income tax rate         3.00%