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Reconciliations of Equity - Reconciliations of Total Equity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Reconciliations of total equity |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | $ 832,221 |  | $ 808,185 | [1],[2] | $ 801,959 |  | $ 766,218 | [2] | $ 808,185 | [1],[2] | $ 766,218 | [2]
Issuance of common stock under stock option plan |  | 273 |  | 1,890 |  | 119 |  | 3,155 |  |  |  |  |
Purchase of common stock |  | (6,104) |  | (77) |  | (9,500) |  | (2,500) |  |  |  |  |
Stock-based and deferred compensation |  | 2,609 |  | (1,360) |  | 2,443 |  | (1,136) |  |  |  |  |
Net income |  | 30,210 | [1],[3] | 24,978 |  | 33,452 | [1],[2],[3] | 31,945 | [2] | 55,188 | [1],[3] | 65,397 | [1],[3]
Other comprehensive income |  | 4,830 |  | 4,248 |  | (34,309) |  | 9,567 |  | 9,078 |  | (24,742) |
Cash dividends paid: |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  | (5,642) |  | (5,643) |  | (5,068) |  | (5,092) |  |  |  |  |
Other | [4] |  |  |  |  |  |  | (198) |  |  |  |  |
Ending Balance |  | 858,397 | [1] | 832,221 |  | 789,096 |  | 801,959 |  | 858,397 | [1] | 789,096 |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliations of total equity |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | 26,441 |  | 26,309 | [2] | 26,268 |  | 26,071 | [2] | 26,309 | [2] | 26,071 | [2]
Issuance of common stock under stock option plan |  | 4 |  | 39 |  | 3 |  | 77 |  |  |  |  |
Stock-based and deferred compensation |  | 8 |  | 93 |  | 8 |  | 120 |  |  |  |  |
Cash dividends paid: |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance |  | 26,453 |  | 26,441 |  | 26,279 |  | 26,268 |  | 26,453 |  | 26,279 |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliations of total equity |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | 185,911 |  | 182,881 | [2] | 175,211 |  | 170,408 | [2] | 182,881 | [2] | 170,408 | [2]
Issuance of common stock under stock option plan |  | 269 |  | 1,851 |  | 116 |  | 3,078 |  |  |  |  |
Stock-based and deferred compensation |  | 2,601 |  | 1,179 |  | 2,452 |  | 1,725 |  |  |  |  |
Cash dividends paid: |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance |  | 188,781 |  | 185,911 |  | 177,779 |  | 175,211 |  | 188,781 |  | 177,779 |
Treasury Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliations of total equity |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | (100,098) |  | (97,389) | [2] | (84,042) |  | (78,561) | [2] | (97,389) | [2] | (78,561) | [2]
Purchase of common stock |  | (6,104) |  | (77) |  | (9,500) |  | (2,500) |  |  |  |  |
Stock-based and deferred compensation |  |  |  | (2,632) |  | (17) |  | (2,981) |  |  |  |  |
Cash dividends paid: |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance |  | (106,202) |  | (100,098) |  | (93,559) |  | (84,042) |  | (106,202) |  | (93,559) |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliations of total equity |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | (142,580) |  | (141,483) | [2] | (90,028) |  | (99,563) | [2] | (141,483) | [2] | (99,563) | [2]
Other comprehensive income |  | 4,857 |  | 4,228 |  | (34,262) |  | 9,535 |  |  |  |  |
Cash dividends paid: |  |  |  |  |  |  |  |  |  |  |  |  |
Other | [5] |  |  | (5,325) |  |  |  |  |  |  |  |  |
Ending Balance |  | (137,723) |  | (142,580) |  | (124,290) |  | (90,028) |  | (137,723) |  | (124,290) |
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliations of total equity |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | 861,773 |  | 837,107 | [2] | 773,707 |  | 747,045 | [2] | 837,107 | [2] | 747,045 | [2]
Net income |  | 30,218 |  | 24,984 |  | 33,454 | [2] | 31,952 | [2] |  |  |  |
Cash dividends paid: |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  | (5,642) |  | (5,643) |  | (5,068) |  | (5,092) |  |  |  |  |
Other |  |  |  | 5,325 | [5] |  |  | (198) | [4] |  |  |  |
Ending Balance |  | 886,349 |  | 861,773 |  | 802,093 |  | 773,707 |  | 886,349 |  | 802,093 |
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliations of total equity |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance | [6] | 774 |  | 760 | [2] | 843 |  | 818 | [2] | 760 | [2] | 818 | [2]
Net income | [6] | (8) |  | (6) |  | (2) | [2] | (7) | [2] |  |  |  |
Other comprehensive income | [6] | (27) |  | 20 |  | (47) |  | 32 |  |  |  |  |
Cash dividends paid: |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance | [6] | $ 739 |  | $ 774 |  | $ 794 |  | $ 843 |  | $ 739 |  | $ 794 |
[1] | The 2018 amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO.
[2] | The retained earnings and net income amounts for the noted line items have been changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO.
[3] | The 2018 amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from the last in, first out (LIFO) basis to the first in, first out (FIFO) basis.
[4] | Reflects beginning retained earnings adjustment as a result of the Company’s first quarter 2018 adoption of ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory.
[5] | Reflects beginning retained earnings adjustment as a result of the Company’s first quarter 2019 adoption of ASU No. 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. See Note 19 for more details.
[6] | Reflects the noncontrolling interest in the Company’s China joint venture.

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