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Stock-Based Compensation (Detail) - (Table 5) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at January 1, 2012			2,815,000
Outstanding at January 1, 2012 (in Dollars per share)			$ 26.03
Granted			34,000
Granted (in Dollars per share)			$ 32.46
Exercised	(48,000)	(432,000)	(80,000)	(503,000)
Exercised (in Dollars per share)			$ 22.53
Outstanding at June 30, 2012	2,769,000		2,769,000
Outstanding at June 30, 2012 (in Dollars per share)	$ 26.21		$ 26.21
Outstanding at June 30, 2012			4 years 3 months 18 days
Outstanding at June 30, 2012 (in Dollars)	$ 21,435		$ 21,435
Exercisable at June 30, 2012	1,565,000		1,565,000
Exercisable at June 30, 2012 (in Dollars per share)	$ 26.15		$ 26.15
Exercisable at June 30, 2012			3 years 8 months 12 days
Exercisable at June 30, 2012 (in Dollars)	$ 12,211		$ 12,211

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

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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. 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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