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2.25% Convertible Senior Notes Due 2019 - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
D
Jun. 30, 2013
Debt Instrument [Line Items]      
Debt Instrument, convertible, terms of conversion   Holders may convert their notes at their option at any time prior to January 1, 2019 only under the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on September 30, 2014 (and only during such calendar quarter), if the last reported sale price of the common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; (2) during the five business day period after any five consecutive trading day period (the “measurement period”) in which the trading price per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of our common stock and the conversion rate on each such trading day; or (3) upon the occurrence of specified corporate events. On or after January 1, 2019 until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their notes at any time, regardless of the foregoing circumstances. Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of our common stock or a combination of cash and shares of our common stock, at our election.  
Debt Instrument, convertible maturity start date   Jan. 01, 2019  
Debt instrument, convertible trading days   20  
Debt instrument, convertible consecutive trading days   30 days  
Debt instrument, convertible business days   5 days  
Debt discount $ 0 $ 0  
Transaction costs 0 0  
Net proceeds from issuance of convertible debt   330,000,000  
Net of deferred income tax effect amounts   (8,672,289) (1,815,001)
Minimum [Member]
      
Debt Instrument [Line Items]      
Percentage of debt conversion price   130.00%  
2.25% Convertible Senior Notes Due 2019 [Member]
      
Debt Instrument [Line Items]      
Debt instrument, aggregate principal amount 330,000,000 330,000,000  
Debt instrument, interest rate 2.25% 2.25%  
Debt instrument, maturity year   2019  
Debt instrument, maturity end date   Jul. 01, 2019  
Debt instrument description   The Notes are unsecured, unsubordinated obligations of the Company, which pay interest in cash semi-annually, on January 1 and July 1, at a rate of 2.25% per annum.  
Converted condition description   The Notes may be converted, under the conditions specified below, based on an initial conversion rate of 7.9353 shares of common stock per $1,000 principal amount of Notes (equivalent to an initial conversion price of approximately $126.02 per share of common stock)  
Debt conversion, converted instrument, principal amount   1,000  
Initial conversion rate   7.9353%  
Debt conversion price per share of common stock $ 126.02 $ 126.02  
Proceeds from issuance of convertible debt, net of transaction cost   322,000,000  
2.25% Convertible Senior Notes Due 2019 [Member]
      
Debt Instrument [Line Items]      
Debt instrument, aggregate principal amount 330,000,000 330,000,000  
Debt instrument, interest rate 2.25% 2.25%  
Debt instrument, maturity year   2019  
Debt conversion, converted instrument, principal amount   1,000  
Initial conversion rate   7.9353%  
Debt conversion price per share of common stock $ 126.02 $ 126.02  
Net carrying amount 283,015,125 283,015,125  
Debt discount 46,984,875 46,984,875  
Effective interest rate after allocation of transaction costs 6.10% 6.10%  
Cash flows, discount rate   5.55%  
Deferred tax liabilities, convertible notes 16,444,706 16,444,706  
Capped Call Transactions [Member]
      
Debt Instrument [Line Items]      
Strike price, per share   $ 126.02  
Approximate cap price, per share $ 155.81 $ 155.81  
Capped Call Transactions [Member] | 2.25% Convertible Senior Notes Due 2019 [Member]
      
Debt Instrument [Line Items]      
Transaction costs   8,268,040  
Net proceeds from issuance of convertible debt   321,731,960  
Payment for capped call transactions   19,668,000  
Net of deferred income tax effect amounts   12,784,200  
Measurement Period [Member]
      
Debt Instrument [Line Items]      
Debt conversion, converted instrument, principal amount   $ 1,000  
Debt instrument, convertible consecutive trading days   5 days  
Measurement Period [Member] | Maximum [Member]
      
Debt Instrument [Line Items]      
Percentage of debt conversion price   98.00%