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Employee Benefit Plans (Narrative) (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Expense related to benefit plans | $ 11,600,000 | $ 11,300,000 | $ 10,800,000
Net actuarial loss expected to be recognized | $ 5,400,000 |  |
Modeling process confidence ratio | 90.00% |  |
Percentage of equity investments in mutual fund | 68.00% |  |
Net periodic benefit cost, Expected return on plan assets | 7.25% | 7.25% | 7.25%
Expected defined benefit plans contribution within a year | $ 1,100,000 |  |
Target percentage of pay at age 55 | 45.00% |  |
Target percentage of pay at age 60 | 60.00% |  |
Stock purchase plan expense | $ 8,235,000 | $ 9,660,000 | $ 9,142,000
Number of stock plans | 3 |  |
Share-based compensation arrangement by share-based payment award, number of shares available for grant | 1,452,452 |  |
Intrinsic value of outstanding in-the-money stock options | $ 104,500,000 |  |
Outstanding in-the-money exercisable stock options | 82,900,000 |  |
Dividends, share-based compensation | $ 0.54 |  |
Share-based compensation arrangement by share-based payment award, fair value assumptions, risk free interest rate | 1.00% | 2.05% | 2.33%
Weighted-average fair value of stock options granted |  | $ 10.23 | $ 16.97
Performance Shares [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Options awarded during period | 28,420 |  |
Award payout percentage at less than 25th percentile level of achievement | 0.00% |  |
Award payout percentage at the 25th percentile level of achievement | 50.00% |  |
Award payout percentage at the 50th percentile level of achievement | 100.00% |  |
Award payout percentage at the 75th percentile level of achievement | 150.00% |  |
Employee Stock Option [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Options awarded during period | 0 | 890,940 | 917,750
401(k) Plan [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Contribution match by employer | 100.00% |  |
Participants contribution eligible for match | 6.00% |  |
Stock purchase plan expense | $ 13,600,000 | $ 13,300,000 | $ 12,300,000
Equity Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Target asset allocation percentage | 65.00% |  |
Fixed Income Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Target asset allocation percentage | 32.00% |  |
Two Thousand Fifteen Plan [Member] | Stock Options [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Life period of options awarded, years | 10 years | 10 years |
Vesting period of options awarded, years | 4 years | 4 years |
Two Thousand Fifteen Plan [Member] | Non Vested Stock Awards and Stock Units [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Life period of options awarded, years | 10 years | 10 years |
Cliff vesting period, years | 4 years | 4 years |
Two Thousand Five Plan [Member] | Stock Options [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Life period of options awarded, years |  |  | 10 years
Vesting period of options awarded, years |  |  | 4 years
Two Thousand Five Plan [Member] | Non Vested Stock Awards and Stock Units [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Life period of options awarded, years |  |  | 10 years
Cliff vesting period, years |  |  | 4 years
2007 Directors Plan [Member] | Stock Options [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Options awarded during period | 0 | 0 | 0
Minimum [Member] | 401(k) Plan [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Contribution percentage of eligible compensation | 2.00% |  |
Maximum [Member] | Performance Shares [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Options awarded during period | 42,630 |  |
Weighted-average fair value of stock options granted | $ 69.70 |  |
Maximum [Member] | 401(k) Plan [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Contribution percentage of eligible compensation | 50.00% |  |

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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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