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Reconciliations of Equity - Reconciliations of Total Equity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Reconciliations of total equity |  |  |  |  |
Beginning Balance |  | $ 867,472 | $ 832,221 | $ 892,496 | $ 808,185
Issuance of common stock under stock option plan |  | 237 | 273 | 392 | 2,163
Purchase of common stock |  | (6,510) | (6,104) | (13,753) | (6,181)
Stock-based and deferred compensation |  | 3,043 | 2,609 | 4,159 | 1,249
Net income |  | 35,843 | 30,210 | 63,382 | 55,188
Other comprehensive income |  | 4,345 | 4,830 | (36,044) | 9,078
Cash dividends paid: |  |  |  |  |
Common stock |  | (6,169) | (5,642) | (12,371) | (11,285)
Ending Balance |  | 898,261 | 858,397 | 898,261 | 858,397
Common Stock [Member] |  |  |  |  |
Reconciliations of total equity |  |  |  |  |
Beginning Balance |  | 26,541 | 26,441 | 26,493 | 26,309
Issuance of common stock under stock option plan |  | 4 | 4 | 7 | 43
Stock-based and deferred compensation |  | 7 | 8 | 52 | 101
Cash dividends paid: |  |  |  |  |
Ending Balance |  | 26,552 | 26,453 | 26,552 | 26,453
Additional Paid-in Capital [Member] |  |  |  |  |
Reconciliations of total equity |  |  |  |  |
Beginning Balance |  | 195,661 | 185,911 | 193,135 | 182,881
Issuance of common stock under stock option plan |  | 233 | 269 | 385 | 2,120
Stock-based and deferred compensation |  | 3,053 | 2,601 | 5,427 | 3,780
Cash dividends paid: |  |  |  |  |
Ending Balance |  | 198,947 | 188,781 | 198,947 | 188,781
Treasury Stock [Member] |  |  |  |  |
Reconciliations of total equity |  |  |  |  |
Beginning Balance |  | (122,685) | (100,098) | (114,139) | (97,389)
Purchase of common stock |  | (6,510) | (6,104) | (13,753) | (6,181)
Stock-based and deferred compensation |  | (17) |  | (1,320) | (2,632)
Cash dividends paid: |  |  |  |  |
Ending Balance |  | (129,212) | (106,202) | (129,212) | (106,202)
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Reconciliations of total equity |  |  |  |  |
Beginning Balance |  | (176,546) | (142,580) | (136,170) | (141,483)
Other comprehensive income |  | 4,343 | 4,857 | (36,033) | 9,085
Cash dividends paid: |  |  |  |  |
Other | [1] |  |  |  | (5,325)
Ending Balance |  | (172,203) | (137,723) | (172,203) | (137,723)
Retained Earnings [Member] |  |  |  |  |
Reconciliations of total equity |  |  |  |  |
Beginning Balance |  | 943,807 | 861,773 | 922,464 | 837,107
Net income |  | 35,707 | 30,218 | 63,252 | 55,202
Cash dividends paid: |  |  |  |  |
Common stock |  | (6,169) | (5,642) | (12,371) | (11,285)
Other | [1] |  |  |  | 5,325
Ending Balance |  | 973,345 | 886,349 | 973,345 | 886,349
Noncontrolling Interest [Member] |  |  |  |  |
Reconciliations of total equity |  |  |  |  |
Beginning Balance | [2] | 694 | 774 | 713 | 760
Net income | [2] | 136 | (8) | 130 | (14)
Other comprehensive income | [2] | 2 | (27) | (11) | (7)
Cash dividends paid: |  |  |  |  |
Ending Balance | [2] | $ 832 | $ 739 | $ 832 | $ 739
[1] | 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.
[2] | Reflects the noncontrolling interest in the Company’s China joint venture.

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