Quarterly report pursuant to Section 13 or 15(d)

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

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Shareholders' (Deficit) Equity - Summary of Changes in Shareholders' (Deficit) Equity (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Equity [Abstract]        
Total shareholders' equity as of December 31, 2013     $ 551,446  
Net income 119,532 143,162 194,160 262,035
Issuance of common shares from exercise of stock options, SARs, restricted stock grants, and employee stock purchase plan     2,039  
Excess tax benefit from exercise of stock options, SARs and restricted stock grants     6,693  
Additional capital from share-based compensation     23,398  
Repurchases of common shares, including Forward Transactions     (1,277,929)  
Allocation to additional paid-in capital due to issuance of the Convertible Notes and Forward Transactions.     249,797  
Reduction in additional paid-in capital from the Capped Call Transactions     (123,825)  
Dividends paid and received, net     (26,984)  
Foreign currency translation adjustment, net of income taxes 2,366 (9,247) 182 (17,931)
Unrealized loss on derivatives, net of income taxes (2,763) 6,675 (3,178) 5,343
Unrealized gain on available-for-sale investments, net of income taxes 225   133  
Total shareholders' deficit as of June 30, 2014 $ (404,068)   $ (404,068)