Stockholders' Equity - Summary of Changes in Common Stock and Common Stock in Treasury (Detail) - shares	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, beginning of year	224,683,653	205,707,580	204,660,621
Shares issued for Grace Settlement		18,000,000
Restricted stock shares issued for new awards under the Omnibus Incentive Plan and 2005 Contingent Stock Plan	419,844	572,089	398,230
Restricted stock shares, forfeited	(185,056)
Shares issued for vested restricted stock units	172,071	136,197	98,550
Shares issued for SLO awards	71,893	101,062	51,321
Number of shares issued, end of year	225,625,636	224,683,653	205,707,580
Number of shares held, beginning of year	14,151,759	9,508,908	10,102,952
Number of common stock shares repurchased	16,100,000
Restricted stock shares, forfeited	185,056
Number of shares held, end of year	29,612,337	14,151,759	9,508,908
Common stock, shares outstanding	196,013,299	210,531,894	196,198,672
Common Stock in Treasury [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock shares, forfeited		(106,220)	(40,100)
Number of common stock shares repurchased	16,123,111	5,427,432
Profit sharing contribution paid in stock	(787,463)	(965,238)	(857,754)
Restricted stock share forfeitures transferred to Omnibus Incentive Plan Reserve	(75,638)
Restricted stock shares, forfeited		106,220	40,100
Shares withheld for taxes	200,568	74,437	223,610
2002 Directors Stock Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted and issued under the Omnibus Incentive Plan and Directors Stock Plan to Directors	20,246	21,128	25,993
2012 Three-year PSU Awards [member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock shares issued for new awards under the Omnibus Incentive Plan and 2005 Contingent Stock Plan	442,985
2011 Three-year PSU Awards [member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock shares issued for new awards under the Omnibus Incentive Plan and 2005 Contingent Stock Plan		145,597
2010 Three-year PSU Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock shares issued for new awards under the Omnibus Incentive Plan and 2005 Contingent Stock Plan			472,865

Profit sharing contribution paid in stock.

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Share based compensation arrangement by share based payment award equity instruments other than options granted and issued in period.

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Share based compensation arrangement by share based payment award equity instruments other than options withheld for taxes in period.

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Shares issued for settlement.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Number of shares (or other type of equity) forfeited during the period.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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

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