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Significant Unobservable Inputs in Estimation of Fair Value (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |  |
Fair value of plan assets at beginning of year |  | $ 378,194 |  |
Fair value of plan assets at end of year |  | 370,497 |  | $ 378,194
Real Estate Funds |  |  |  |
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |  |
Fair value of plan assets at beginning of year | [1] | 14,651 |  |
Fair value of plan assets at end of year | [1] | 17,336 |  | 14,651
Hedge Funds, Equity |  |  |  |
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |  |
Fair value of plan assets at beginning of year |  | 14,300 |  |
Fair value of plan assets at end of year |  | 500 |  | 14,300
Absolute Return Funds |  |  |  |
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |  |
Fair value of plan assets at beginning of year |  | 8,000 |  |
Fair value of plan assets at end of year |  | 8,000 |  | 8,000
Level 3 |  |  |  |
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |  |
Fair value of plan assets at beginning of year |  | 154,329 |  | 161,578
Total gains or losses (realized and unrealized) |  | 5,378 |  | 10,207
Purchases |  | 4,399 |  | 440
Issues |  | 736 |  | 641
Sales |  | (22,576) |  | (18,357)
Settlements |  | 94 |  | (180)
Fair value of plan assets at end of year |  | 142,360 |  | 154,329
Level 3 | Real Estate Funds |  |  |  |
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |  |
Fair value of plan assets at beginning of year |  | 14,651 | [1] | 13,298
Total gains or losses (realized and unrealized) |  | 2,170 |  | 954
Issues |  | 736 |  | 636
Sales |  | (221) |  | (237)
Fair value of plan assets at end of year | [1] | 17,336 |  | 14,651
Level 3 | Hedge Funds, Equity |  |  |  |
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |  |
Fair value of plan assets at beginning of year |  | 52,420 |  | 58,176
Total gains or losses (realized and unrealized) |  | 2,452 |  | 4,280
Sales |  | (14,290) |  | (10,036)
Fair value of plan assets at end of year |  | 40,582 |  | 52,420
Level 3 | Guaranteed Insurance Contracts |  |  |  |
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |  |
Fair value of plan assets at beginning of year |  | 9,450 |  | 9,594
Total gains or losses (realized and unrealized) |  |  |  | (5)
Purchases |  | 399 |  | 440
Issues |  |  |  | 5
Sales |  | (65) |  | (584)
Fair value of plan assets at end of year |  | 9,784 |  | 9,450
Level 3 | Absolute Return Funds |  |  |  |
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |  |
Fair value of plan assets at beginning of year |  | 78,094 |  | 80,616
Total gains or losses (realized and unrealized) |  | 756 |  | 4,978
Purchases |  | 4,000 |  |
Sales |  | (8,000) |  | (7,500)
Fair value of plan assets at end of year |  | 74,850 |  | 78,094
Level 3 | Other Assets And Liabilities And Accrued Income |  |  |  |
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] |  |  |  |
Fair value of plan assets at beginning of year |  | (286) |  | (106)
Settlements |  | 94 |  | (180)
Fair value of plan assets at end of year |  | $ (192) |  | $ (286)
[1] | This class includes funds that invest primarily in U.S. commercial real estate.

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- Definition Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items] + References No definition available. + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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