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Changes in Accumulated Other Comprehensive Income (Loss) By Component (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  | $ 920,964 | $ 855,872 |  |
Ending balance | $ 936,227 | $ 910,289 | 936,227 | 910,289 |  |
Accumulated other comprehensive loss, net | 33,997 |  | 33,997 |  |  | $ 359
Retained earnings | 299,990 |  | 299,990 |  |  | 258,076
Unrealized Gains (Losses) |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | (26,691) |  | (249) |  |  |
Balance after reclassification adjustments on January 1, 2018 |  |  |  |  |  | (1,458)
Other comprehensive income (loss) before reclassifications | (9,020) |  | (34,253) |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) to net income | 0 |  | 0 |  |  |
Net current-period other comprehensive income (loss) | (9,020) |  | (34,253) |  |  |
Ending balance | (35,711) |  | (35,711) |  |  |
Foreign Currency Items |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | 0 |  | 88 |  |  |
Balance after reclassification adjustments on January 1, 2018 |  |  |  |  |  | 0
Other comprehensive income (loss) before reclassifications | 0 |  | 0 |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) to net income | 0 |  | 0 |  |  |
Net current-period other comprehensive income (loss) | 0 |  | 0 |  |  |
Ending balance | 0 |  | 0 |  |  |
Total Unrealized Gains (Losses) |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | (26,691) | (3,366) | (161) | (2,681) |  |
Balance after reclassification adjustments on January 1, 2018 |  |  |  |  |  | (1,458)
Other comprehensive income (loss) before reclassifications | (9,020) | 12,130 | (34,253) | 11,445 |  |
Amounts reclassified from accumulated other comprehensive income (loss) to net income | 0 | (1,942) | 0 | (1,942) |  |
Net current-period other comprehensive income (loss) | (9,020) | 10,188 | (34,253) | 9,503 |  |
Ending balance | (35,711) | 6,822 | (35,711) | 6,822 |  |
Unrealized Gains (Losses) on Cash Flow Hedges |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | 503 | (1,506) | (198) | (2,211) |  |
Balance after reclassification adjustments on January 1, 2018 |  |  |  |  |  | (240)
Other comprehensive income (loss) before reclassifications | 1,403 | (420) | 2,049 | (219) |  |
Amounts reclassified from accumulated other comprehensive income (loss) to net income | (192) | 468 | (95) | 972 |  |
Net current-period other comprehensive income (loss) | 1,211 | 48 | 1,954 | 753 |  |
Ending balance | 1,714 | (1,458) | 1,714 | (1,458) |  |
Accumulated Other Comprehensive Loss |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | (26,188) | (4,872) | (359) | (4,892) |  |
Balance after reclassification adjustments on January 1, 2018 |  |  |  |  |  | (1,698)
Other comprehensive income (loss) before reclassifications | (7,617) | 11,710 | (32,204) | 11,226 |  |
Amounts reclassified from accumulated other comprehensive income (loss) to net income | (192) | (1,474) | (95) | (970) |  |
Net current-period other comprehensive income (loss) | (7,809) | 10,236 | (32,299) | 10,256 |  |
Ending balance | (33,997) | 5,364 | (33,997) | 5,364 |  |
Retained Earnings |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  | 258,076 | 193,698 |  |
Ending balance | $ 299,990 | $ 235,938 | $ 299,990 | $ 235,938 |  |
ASU 2018-02 | Unrealized Gains (Losses) |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | $ (256) |
ASU 2018-02 | Foreign Currency Items |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | 0 |
ASU 2018-02 | Total Unrealized Gains (Losses) |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | (256) |
ASU 2018-02 | Unrealized Gains (Losses) on Cash Flow Hedges |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | (42) |
ASU 2018-02 | Accumulated Other Comprehensive Loss |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | (298) |
Accounting Standards Update 2016-01 |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  | $ 0
Accounting Standards Update 2016-01 | Unrealized Gains (Losses) |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | (953) |
Accounting Standards Update 2016-01 | Foreign Currency Items |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | (88) |
Accounting Standards Update 2016-01 | Total Unrealized Gains (Losses) |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | (1,041) |
Accounting Standards Update 2016-01 | Unrealized Gains (Losses) on Cash Flow Hedges |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | 0 |
Accounting Standards Update 2016-01 | Accumulated Other Comprehensive Loss |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | (1,041) |
Accounting Standards Update 2016-01 | Retained Earnings |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | 1,041 |
Combined effect of multiple accounting pronouncements on components of shareholders' equity | Accumulated Other Comprehensive Loss |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | (1,300) |
Combined effect of multiple accounting pronouncements on components of shareholders' equity | Retained Earnings |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | $ 1,300 |

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