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

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including 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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Summary of Stock Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013
Options
Outstanding at January 1, 2013	1,513,000
Granted	0	0	0
Exercised	(728,000)
Forfeited/expired	(98,000)
Outstanding at December 31, 2013	687,000	1,513,000
Expected to Vest at December 31, 2013	132,000
Exercisable at December 31, 2013	529,000
Weighted Average Exercise Price
Outstanding at January 1, 2013	$ 14.81
Granted	$ 0.00
Exercised	$ 13.71
Forfeited/expired	$ 15.29
Outstanding at December 31, 2013	$ 15.95	$ 14.81
Expected to Vest at December 31, 2013	$ 19.92
Exercisable at December 31, 2013	$ 14.77
Weighted Average Remaining Contractual Term
Outstanding at December 31, 2013	4 years 9 months
Expected to Vest at December 31, 2013	6 years 1 month 24 days
Exercisable at December 31, 2013	4 years 3 months 29 days
Aggregate Intrinsic Value
Outstanding at January 1, 2013				$ 9,233
Expected to Vest at December 31, 2013	1,253
Exercisable at December 31, 2013	$ 7,740
Weighted Average Fair Value
Outstanding at December 31, 2013	$ 7.02
Expected to Vest at December 31, 2013	$ 10.67
Exercisable at December 31, 2013	$ 5.94