Summary of Common Stock Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised (in shares)	277,687	223,022	94,115
Restricted stock expense	$ 4,129	$ 4,744	$ 4,370
Stock option expense	2,825	2,435	2,343
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balances (in shares)	(62,081,391)	(62,081,391)	(62,081,391)
Ending Balances (in shares)	(62,081,391)	(62,081,391)	(62,081,391)
Beginning Balances	112,135	97,276	88,629
Restricted stock awards	(505)	(711)	(542)
Restricted stock expense	4,244	4,891	4,376
Restricted stock forfeitures	(115)	(147)	(6)
Stock options exercised	8,194	3,141	825
Stock option expense	2,825	2,435	2,343
Performance stock issued	(352)	(303)
Performance stock expense	3,383	2,831	1,019
Tax benefit related to stock plans	2,246	2,799	632
Other, net		(77)
Ending Balances	132,055	112,135	97,276
Stock Compensation Trust
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balances (in shares)	(745,430)	(1,162,784)	(1,360,714)
Restricted stock awards (in shares)	96,686	136,295	103,815
Stock options exercised (in shares)	277,687	223,022	94,115
Performance stock issued	67,389	58,037
Ending Balances (in shares)	(303,668)	(745,430)	(1,162,784)
Beginning Balances	(3,891)	(6,070)	(7,103)
Restricted stock awards	505	711	542
Stock options exercised	1,449	1,165	491
Performance stock issued	352	303
Ending Balances	(1,585)	(3,891)	(6,070)
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balances (in shares)	(24,328,162)	(24,226,017)	(24,200,951)
Restricted stock forfeitures (in shares)	(7,365)	(10,815)	(7,469)
Treasury shares purchased (in shares)	(240,097)	(91,330)	(17,597)
Ending Balances (in shares)	(24,575,624)	(24,328,162)	(24,226,017)
Beginning Balances	(267,987)	(264,479)	(263,855)
Treasury shares purchased	(11,785)	(3,508)	(624)
Ending Balances	$ (279,772)	$ (267,987)	$ (264,479)

Restricted stock award forfeitures shares.

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Stock issued during period performance stock expense.

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The value of shares of common stock issued during the reporting period under performance based unit awards.

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Value of shares of other common stock instruments held by shareholders, such as exchangeable shares. May be all or portion of the number of common shares authorized.

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Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

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The total value of forfeitures related to restricted stock awards forfeited during the period.

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Number of shares that have been repurchased during the period and are being held in treasury.

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