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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 137,092 | $ 121,835 | $ 126,369
Commodities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 2,523 | 1,481 |
Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 99,872 | 76,708 |
Level 1 [Member] | Commodities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 2,523 | 1,481 |
Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 37,220 | 45,127 |
Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 3,908 | 1,989 |
Cash and Cash Equivalents [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 3,633 |  |
Cash and Cash Equivalents [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 275 | 1,989 |
U.S. Equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 29,390 | 33,076 |
U.S. Equities [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 29,390 | 33,076 |
Non-U.S. Equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 14,637 | 10,630 |
Non-U.S. Equities [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 14,637 | 10,630 |
Employer Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 36,018 | 24,792 |
Employer Securities [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 36,018 | 24,792 |
Equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 80,045 | 68,498 |
Equities [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 80,045 | 68,498 |
U.S. Corporate Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 28,278 | 26,389 |
U.S. Corporate Bonds [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 28,278 | 26,389 |
U.S. Government and Agency Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 9,280 | 9,736 |
U.S. Government and Agency Bonds [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 8,309 | 365 |
U.S. Government and Agency Bonds [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 971 | 9,371 |
Other Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 7,696 | 7,378 |
Other Bonds [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 7,696 | 7,378 |
Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 45,254 | 43,503 |
Debt Securities [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 8,309 | 365 |
Debt Securities [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 36,945 | 43,138 |
Real Estate Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 5,362 | 5,222 |
Real Estate Fund [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | 5,362 | 5,222 |
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 | 7,885 | 7,845 |
Mutual Funds | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total | $ 7,885 | $ 7,845 |

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