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Stock-Based Compensation - Summary of Activity Under Stock Option Plan (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding [Roll Forward]
Outstanding at ending period - Aggregate Intrinsic Value	$ 24,003
Exercisable at ending period - Aggregate Intrinsic Value	$ 14,763
Outstanding at ending period - Wgtd. Avg. Remaining Contractual Term, years	8 years 8 months 9 days
Exercisable at ending period - Wgtd. Avg. Remaining Contractual Term, years	5 years 6 months 15 days
Outstanding at beginning period - Wgtd. Avg. Exercise Price	$ 31.98
Options granted - Wgtd. Avg. Exercise Price	$ 44.11
Options exercised - Wgtd. Avg. Exercise Price	$ 25.13
Options cancelled, forfeited, or expired - Wgtd. Avg. Exercise Price	$ 43.02
Outstanding at ending period - Wgtd. Avg. Exercise Price	$ 33.26
Exercisable at ending period - Wgtd. Avg. Exercise Price	$ 26.74
Outstanding at beginning period - Options	1,216,981
Options granted	60,000
Options exercised	(118,414)
Options cancelled, forfeited, or expired - Options	(5,000)
Outstanding at ending period - Options	1,153,567
Exercisable at ending period - Options	540,167

X

- Definition

Share Based Compensation Arrangement By Share Based Payment Award Options Cancelled Expired In Period Weighted Average Exercise Price

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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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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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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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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- Definition

For presentations that combine terminations, 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 or that expired.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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 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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