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Stockholders' Equity - Summary of Changes in Common Stock and Common Stock in Treasury (Detail) - shares | 12 Months Ended
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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

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options granted and issued in period. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options withheld for taxes in period. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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