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Reconciliation of Federal Statutory Rate to Effective Income Tax Rate (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Rate Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income before income taxes | $ 1,549 | $ (2,022) | $ 3,654 | $ 4,067 | $ 1,566 | $ 2,214 | $ 5,372 | $ 2,540 | $ 7,248 | $ 11,692 | $ 13,423
Expected tax at statutory rate |  |  |  |  |  |  |  |  | 2,537 | 3,975 | 4,564
Adjustments due to: |  |  |  |  |  |  |  |  |  |  |
Difference between U.S. and foreign tax |  |  |  |  |  |  |  |  | (1,797) | (2,031) | (1,910)
State income and franchise taxes |  |  |  |  |  |  |  |  | (307) | (326) | 563
Business tax credits |  |  |  |  |  |  |  |  | (7,708) | (236) | (115)
Stock compensation |  |  |  |  |  |  |  |  | (946) | 31 | 348
Transaction costs |  |  |  |  |  |  |  |  | 1,232 | 156 |
Other |  |  |  |  |  |  |  |  | 470 | 380 | (230)
Change in U.S. federal tax rates |  |  |  |  |  |  |  |  | (12,839) |  |
Transition tax |  |  |  |  |  |  |  |  | 3,266 |  |
Change in valuation allowance |  |  |  |  |  |  |  |  | (12,164) | (1,981) | 1,216
Other |  |  |  |  |  |  |  |  | (151) | 43 | (358)
Provision for income taxes | $ (10,629) | $ (6,691) | $ (4,784) | $ 999 | $ (3,463) | $ 1,059 | $ 1,500 | $ 915 | $ (21,105) | $ 11 | $ 4,078
Expected tax at statutory rate |  |  |  |  |  |  |  |  | 35.00% | 34.00% | 34.00%
Adjustments due to: |  |  |  |  |  |  |  |  |  |  |
Difference between U.S. and foreign tax |  |  |  |  |  |  |  |  | (24.80%) | (17.40%) | (14.20%)
State income and franchise taxes |  |  |  |  |  |  |  |  | (4.20%) | (2.80%) | 4.20%
Business tax credits |  |  |  |  |  |  |  |  | (9.80%) | (2.00%) | (0.90%)
Stock compensation |  |  |  |  |  |  |  |  | (13.10%) | 0.30% | 2.60%
Transaction costs |  |  |  |  |  |  |  |  | 17.00% | 1.30% |
Other |  |  |  |  |  |  |  |  | 6.40% | 3.20% | (1.70%)
Change in U.S. federal tax rates |  |  |  |  |  |  |  |  | (177.20%) |  |
Transition tax |  |  |  |  |  |  |  |  | 45.10% |  |
Change in valuation allowance |  |  |  |  |  |  |  |  | (167.80%) | (16.90%) | 9.10%
Other |  |  |  |  |  |  |  |  | (2.10%) | 0.40% | (2.70%)
Provision for income taxes |  |  |  |  |  |  |  |  | (291.20%) | 0.10% | 30.40%

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible equity-based compensation costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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