Summary of Stock Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Options Outstanding
Outstanding, beginning balance	814,291
Granted	248,388
Forfeited	(59,545)
Exercised	(104,705)
Outstanding, ending balance	898,429
Options exercisable at end of period	446,760
Weighted-Average Exercise Price
Outstanding, beginning balance	$ 39.56
Granted	$ 56.81
Forfeited	$ 43.47
Exercised	$ 35.48
Outstanding, ending balance	$ 44.40
Options exercisable at end of period	$ 36.78
Weighted-Average Remaining Contractual Term
Outstanding at end of period	4 years 3 months 18 days
Options exercisable at end of period	2 years 10 months 24 days
Aggregate Intrinsic Value
Outstanding at end of period	$ 16,427
Options exercisable at end of period	$ 11,569

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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.

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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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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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Weighted average price of options that were either forfeited or 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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