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Shareholders' Equity - Components of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning Balance | $ 263,477 | $ 263,477 | $ 290,311 | $ 299,627
Other comprehensive income (loss) |  | 8,382 | (2,830) |
Income taxes |  | (1,475) | 791 |
Other expense, net | 5,600 | 5,585 | 2,727 |
Income taxes |  | 29,100 | 15,527 | 10,849
Ending Balance |  | 296,608 | 263,477 | 290,311
Reclassification Adjustments [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Other expense, net |  | 5,585 | 2,727 |
Income taxes |  | (2,125) | (1,036) |
Currency Translation Adjustments [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning Balance | (5,115) | (5,115) | (4,389) |
Other comprehensive income (loss) |  | 4,552 | (726) |
Ending Balance |  | (563) | (5,115) | (4,389)
Derivatives [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning Balance |  |  | 228 |
Other comprehensive income (loss) |  |  | (360) |
Income taxes |  |  | 132 |
Ending Balance |  |  |  | 228
Debt Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning Balance | (1,465) | (1,465) | (2,071) |
Other comprehensive income (loss) |  | 3,830 | (1,744) |
Income taxes |  | (1,475) | 659 |
Ending Balance |  | 4,350 | (1,465) | (2,071)
Debt Securities [Member] | Reclassification Adjustments [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Other expense, net |  | 5,585 | 2,727 |
Income taxes |  | (2,125) | (1,036) |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning Balance | $ (6,580) | (6,580) | (6,232) | (382)
Ending Balance |  | $ 3,787 | $ (6,580) | $ (6,232)

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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