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Stock Compensation Plans - Stock Option Transactions Under Various Stock-Based Employee Compensation Plans (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding, Beginning Balance, Shares	2,124,886
Granted, Shares	1,807,000
Exercised, Shares	(682,263)	(586,563)	(113,359)
Canceled, Shares	(17,200)
Outstanding, Ending Balance, Shares	3,232,423	2,124,886
Exercisable, Ending Balance, Shares	1,737,823
Outstanding, Beginning Balance, Weighted Average Exercise Price	$ 22.36
Granted, Weighted Average Exercise Price	$ 42.31
Exercised, Weighted-Average Exercise Price	$ 24.90
Canceled, Weighted Average Exercise Price	$ 38.73
Outstanding, Ending Balance, Weighted Average Exercise Price	$ 32.89	$ 22.36
Exercisable, Ending Balance, Weighted Average Exercise Price	$ 25.16
Outstanding, Ending balance, Weighted Average Remaining Contractual Term	7 years 4 months 13 days
Exercisable, Ending Balance, Weighted Average Remaining Contractual Term	5 years 11 months 12 days

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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