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Stock-Based Compensation (Detail) - (Table 5) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at January 1, 2012				2,802,000
Outstanding at January 1, 2012 (in Dollars per share)				$ 26.85
Granted	225,000			499,000
Granted (in Dollars per share)				$ 34.61
Exercised		(4,000)	(48,000)	(52,000)	(80,000)
Exercised (in Dollars per share)				$ 20.58
Cancelled/Forfeited				(317,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price				$ 38.94
Outstanding at June 30, 2012	2,932,000	2,932,000		2,932,000
Outstanding at June 30, 2012 (in Dollars per share)	$ 26.97	$ 26.97		$ 26.97
Outstanding at June 30, 2012				3 years 8 months 12 days
Outstanding at June 30, 2012 (in Dollars)	$ 686	$ 686		$ 686
Exercisable at June 30, 2012	2,062,000	2,062,000		2,062,000
Exercisable at June 30, 2012 (in Dollars per share)	$ 27.21	$ 27.21		$ 27.21
Exercisable at June 30, 2012				3 years 7 months 6 days
Exercisable at June 30, 2012 (in Dollars)	$ 620	$ 620		$ 620

X

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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 price of options that were either forfeited or expired.

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Gross 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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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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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