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2.25% Convertible Senior Notes Due 2019 - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended	6 Months Ended
	Dec. 31, 2014 D	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014	Jun. 30, 2014
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
Net proceeds from issuance of convertible debt	$ 330,000,000us-gaap_ProceedsFromConvertibleDebt
Payment for capped call transactions	19,668,000
Net of deferred income tax effect amounts	(20,236,973)us-gaap_DeferredIncomeTaxExpenseBenefit	(7,847,513)us-gaap_DeferredIncomeTaxExpenseBenefit	(492,362)us-gaap_DeferredIncomeTaxExpenseBenefit
Minimum [Member]
Debt Instrument [Line Items]
Percentage of debt conversion price	130.00%
Capped Call Transactions [Member]
Debt Instrument [Line Items]
Strike price, per share	$ 126.02
Approximate cap price, per share	$ 155.81
2.25% Convertible Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal amount	330,000,000			330,000,000	330,000,000
Debt instrument, interest rate	2.25%			2.25%	2.25%
Debt instrument, maturity year	2019			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				1,000
Initial conversion rate	7.9353%				7.9353%
Debt conversion price per share of common stock	$ 126.02			$ 126.02	$ 126.02
Proceeds from issuance of convertible debt, net of transaction cost					322,000,000
Net carrying amount	283,015,125
Debt discount	46,984,875
Effective interest rate after allocation of transaction costs	6.10%
Cash flows, discount rate	5.55%
Deferred tax liabilities, convertible notes	16,444,706
2.25% Convertible Senior Notes Due 2019 [Member] \| Capped Call Transactions [Member]
Debt Instrument [Line Items]
Net proceeds from issuance of convertible debt	321,731,960
Transaction costs	8,268,040
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%