Summary of Stock Option Transactions Relating to Non-Qualified Stock Option Plans (Detail) (Stock options, USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Stock options
Number of Shares
Outstanding at December 31, 2013	2,602
No. of options, Granted	0
No. of options, Exercised	(712)
No. of options, Cancelled	(6)
No. of options, Outstanding at December 31, 2014	1,884
No. of options, Exercisable at December 31, 2014	1,602
Weighted-Average Exercise Price per Share
Weighted-Average Exercise Price of options, Outstanding at December 31, 2013	$ 19.31
Weighted-Average Exercise Price of options, Granted	$ 0
Weighted-Average Exercise Price of options, Exercised	$ 17.47
Weighted-Average Exercise Price of options, Cancelled	$ 22.34
Weighted-Average Exercise Price of options, Outstanding at December 31, 2014	$ 20.00
Weighted-Average Exercise Price of options, Exercisable at December 31, 2014	$ 19.58
Weighted Average Remaining Contractual Term (in years)
Outstanding at December 31, 2014	5 years
Exercisable at December 31, 2014	4 years 7 months 6 days
Aggregate Intrinsic Value
Outstanding at December 31, 2014	$ 30,792
Exercisable at December 31, 2014	$ 26,841

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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 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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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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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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Weighted average remaining contractual term for fully vested and expected to vest options that are 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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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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