Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Summary of Changes in Shareholders' Equity (Detail)

v2.4.0.8
Shareholders' Equity - Summary of Changes in Shareholders' Equity (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Equity [Abstract]    
Total shareholders' equity as of December 31, 2013 $ 551,446  
Net income 74,628 118,873
Issuance of common shares from exercise of stock options, SARs, restricted stock grants, and employee stock purchase plan 60  
Excess tax benefit from exercise of stock options, SARs and restricted stock grants 3,154  
Additional capital from share-based compensation 10,995  
Repurchases of common shares, including Forward Transactions (694,503)  
Allocation to additional paid-in capital due to issuance of senior convertible notes and Forward Transactions. 249,797  
Reduction in additional paid-in capital from purchased capped call (123,825)  
Dividends paid and received, net (26,955)  
Foreign currency translation adjustment, net of income taxes (2,183) (8,684)
Unrealized loss on derivatives, net of income taxes (413) (1,332)
Unrealized loss on available-for-sale investments, net of income taxes (95)  
Total shareholders' equity as of March 31, 2014 $ 42,106