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Acquisitions - Additional Information (Detail) - USD ($) |  |  |  | 2 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 01, 2017 | Dec. 14, 2016 | Apr. 01, 2016 | Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |
Finite lived intangible asset, useful life |  |  |  |  |  | 16 years | 13 years
Goodwill |  |  |  | $ 326,652,000 | $ 326,652,000 | $ 326,652,000 | $ 59,548,000
Common stock, par value |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01
Customer relationships |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Finite lived intangible asset, useful life |  |  |  |  |  | 15 years | 11 years
Technology - developed |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Finite lived intangible asset, useful life |  |  |  |  |  | 19 years | 17 years
Atoll GmbH |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Shares issued for business acquisition |  |  | 538,700 |  |  |  |
Value of common stock issued |  |  | $ 14,138,000 |  |  |  |
Working capital adjustment |  |  | 74,000 |  |  |  |
Business combination, consideration transferred |  |  | 25,266,000 |  |  |  |
Fair value of net assets acquired |  |  | 25,266,000 |  |  |  |
Goodwill |  |  | 17,077,000 |  |  |  |
Goodwill expected to be deductible for tax purposes amount |  |  | 0 |  |  |  |
Business acquisition, transaction costs |  |  | $ 1,307,000 |  |  |  |
Common stock, par value |  |  | $ 0.01 |  |  |  |
Earnout consideration |  |  | $ 1,100,000 |  |  |  |
Estimated fair value of contingent consideration |  |  | 952,000 |  |  |  |
Atoll GmbH | Up Front Payment |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration |  |  | 10,200,000 |  |  |  |
Atoll GmbH | Customer relationships |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of acquired finite lived intangible assets |  |  | $ 5,318,000 |  |  |  |
Finite lived intangible asset, useful life |  |  | 13 years |  |  |  |
Atoll GmbH | Technology - developed |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of acquired finite lived intangible assets |  |  | $ 2,175,000 |  |  |  |
Finite lived intangible asset, useful life |  |  | 14 years |  |  |  |
Atoll GmbH | Non-competition agreements |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of acquired finite lived intangible assets |  |  | $ 57,000 |  |  |  |
Finite lived intangible asset, useful life |  |  | 2 years |  |  |  |
Atoll GmbH | Trademark |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of acquired finite lived intangible assets |  |  | $ 11,000 |  |  |  |
Finite lived intangible asset, useful life |  |  | 2 years |  |  |  |
TangenX Technology Corporation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration |  | $ 37,532,000 |  |  |  |  |
Working capital adjustment |  | (382,000) |  |  |  |  |
Business combination, consideration transferred |  | 37,150,000 |  |  |  |  |
Fair value of net assets acquired |  | 37,150,000 |  |  |  |  |
Goodwill |  | 29,501,000 |  |  |  |  |
Goodwill expected to be deductible for tax purposes amount |  | 0 |  |  |  |  |
Business acquisition, transaction costs |  |  |  |  | $ 0 | $ 376,000 | $ 935,000
TangenX Technology Corporation | Customer relationships |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of acquired finite lived intangible assets |  | $ 6,192,000 |  |  |  |  |
Finite lived intangible asset, useful life |  | 13 years |  |  |  |  |
TangenX Technology Corporation | Technology - developed |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of acquired finite lived intangible assets |  | $ 6,044,000 |  |  |  |  |
Finite lived intangible asset, useful life |  | 20 years |  |  |  |  |
TangenX Technology Corporation | Non-competition agreements |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of acquired finite lived intangible assets |  | $ 21,000 |  |  |  |  |
Finite lived intangible asset, useful life |  | 2 years |  |  |  |  |
TangenX Technology Corporation | Trademark |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of acquired finite lived intangible assets |  | $ 11,000 |  |  |  |  |
Finite lived intangible asset, useful life |  | 5 years |  |  |  |  |
Spectrum Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration | $ 122,932,000 |  |  |  |  |  |
Shares issued for business acquisition | 6,153,995 |  |  |  |  |  |
Value of common stock issued | $ 247,575,000 |  |  |  |  |  |
Working capital adjustment | 955,000 |  |  |  |  |  |
Business combination, consideration transferred | 371,462,000 |  |  |  |  |  |
Fair value of net assets acquired | 371,462,000 |  |  |  |  |  |
Goodwill | 265,084,000 |  |  |  |  |  |
Goodwill expected to be deductible for tax purposes amount | 0 |  |  |  |  |  |
Business acquisition, revenue |  |  |  | $ 7,550,000 |  |  |
Spectrum Inc. | Selling, general and administrative |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  | $ 3,378,000 | $ 5,761,000 |
Spectrum Inc. | Customer relationships |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of acquired finite lived intangible assets | $ 78,400,000 |  |  |  |  |  |
Finite lived intangible asset, useful life | 16 years |  |  |  |  |  |
Spectrum Inc. | Technology - developed |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of acquired finite lived intangible assets | $ 38,560,000 |  |  |  |  |  |
Finite lived intangible asset, useful life | 20 years |  |  |  |  |  |
Spectrum Inc. | Non-competition agreements |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of acquired finite lived intangible assets | $ 960,000 |  |  |  |  |  |
Finite lived intangible asset, useful life | 3 years |  |  |  |  |  |
Spectrum Inc. | Trademark |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of acquired finite lived intangible assets | $ 2,160,000 |  |  |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs which have been expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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