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Postretirement Benefit Plans - Company's Asset Allocations for its U.S. Pension Plans by Asset Category (Detail) - United States [Member] - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 121,835 | $ 126,369 | $ 133,264
Municipal Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 3,352 |
Commodities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,481 | 2,023 |
Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 76,708 | 76,896 |
Level 1 [Member] | Commodities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,481 | 2,023 |
Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 45,127 | 49,473 |
Level 2 [Member] | Municipal Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total |  | 3,352 |
Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,989 | 1,963 |
Cash and Cash Equivalents [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,989 | 1,963 |
U.S. Equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 33,076 | 34,885 |
U.S. Equities [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 33,076 | 34,885 |
Non-U.S. Equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 10,630 | 12,478 |
Non-U.S. Equities [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 10,630 | 12,478 |
Employer Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 24,792 | 21,575 |
Employer Securities [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 24,792 | 21,575 |
Equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 68,498 | 68,938 |
Equities [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 68,498 | 68,938 |
U.S. Corporate Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 26,389 | 27,676 |
U.S. Corporate Bonds [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 26,389 | 27,676 |
U.S. Government and Agency Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 9,736 | 10,677 |
U.S. Government and Agency Bonds [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 365 | 350 |
U.S. Government and Agency Bonds [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 9,371 | 10,327 |
Other Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 7,378 | 6,155 |
Other Bonds [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 7,378 | 6,155 |
Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 43,503 | 47,860 |
Debt Securities [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 365 | 350 |
Debt Securities [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 43,138 | 47,510 |
Real Estate Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 5,222 | 5,585 |
Real Estate Fund [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 5,222 | 5,585 |
Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,142 |  |
Other | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 1,142 |  |
Mutual Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 7,845 | 7,608 |
Mutual Funds | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 7,845 | $ 7,608 |

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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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