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Acquisitions - Additional Information (Detail) - USD ($) |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Jan. 07, 2016 | Jan. 02, 2015 | Nov. 20, 2014 | Jun. 11, 2014 | Mar. 31, 2014 | Mar. 29, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jan. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  | $ 98,385,000 | $ 103,791,000 | $ 58,426,000 |
Cost of sales |  |  |  |  |  |  |  | 1,375,678,000 | 1,391,049,000 | 1,488,816,000 |
Revolving Credit Agreement Mature 2018 [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving credit agreement due 2018 | $ 0 |  |  |  |  |  |  | 0 | 50,000,000 |  | $ 200,000,000
M2 FX Limited [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding shares acquired |  | 100.00% |  |  |  |  |  |  |  |  |
Acquisition price |  | $ 19,000,000 |  |  |  |  |  |  |  |  |
Estimated earn-out consideration | $ 0 | $ 3,200,000 |  |  |  |  |  | 3,200,000 |  |  |
Benefit included in selling, general, and administrative expense |  |  |  |  |  |  |  | $ 3,200,000 |  |  |
Tripwire [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding shares acquired |  |  | 100.00% |  |  |  |  |  |  |  |
Acquisition price |  |  | $ 703,200,000 |  |  |  |  |  |  |  |
Fair value of acquired receivables |  |  | 37,800,000 |  |  |  |  |  |  |  |
Acquired receivable, gross contractual amount |  |  | 38,000,000 |  |  |  |  |  |  |  |
Post acquisition revenues |  |  |  |  |  |  |  |  | 116,600,000 |  |
Post acquisition income (loss) from continuing operations |  |  |  |  |  |  |  |  | (47,800,000) |  |
Impact on reported revenue due to reduction of acquired deferred revenue balance to fair value |  |  |  |  |  |  |  |  | 50,400,000 |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  | 43,200,000 |  |
Compensation expense |  |  |  |  |  |  | $ 9,200,000 |  | $ 9,200,000 |  |
Tripwire [Member] | Pro Forma [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  | 3,000,000 |
Compensation expense |  |  |  |  |  |  |  |  |  | 9,200,000 |
Tripwire [Member] | Revolving Credit Agreement Mature 2018 [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving credit agreement due 2018 |  |  | $ 200,000,000 |  |  |  |  |  |  |  |
Coast Wire and Plastic Tech, LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding shares acquired |  |  |  | 100.00% |  |  |  |  |  |  |
Acquisition price |  |  |  | $ 36,000,000 |  |  |  |  |  |  |
Prosoft Technology, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding shares acquired |  |  |  |  | 100.00% |  |  |  |  |  |
Acquisition price |  |  |  |  | $ 104,100,000 |  |  |  |  |  |
Fair value of acquired receivables |  |  |  |  | 5,900,000 |  |  |  |  |  |
Acquired receivable, gross contractual amount |  |  |  |  | 6,200,000 |  |  |  |  |  |
Post acquisition revenues |  |  |  |  |  |  |  |  |  | 31,700,000 |
Post acquisition income (loss) from continuing operations |  |  |  |  |  |  |  |  |  | (2,500,000) |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  | 2,400,000 |
Goodwill acquired |  |  |  |  | $ 56,900,000 |  |  |  |  |  |
Period for deducting goodwill for tax purposes |  |  |  |  | 15 years |  |  |  |  |  |
Prosoft Technology, Inc. [Member] | Inventories - Obsolescence and Other Valuation Allowances [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  | 1,400,000 |
Grass Valley [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding shares acquired |  |  |  |  |  | 100.00% |  |  |  |  |
Acquisition price |  |  |  |  |  | $ 218,200,000 |  |  |  |  |
Fair value of acquired receivables |  |  |  |  |  | 67,400,000 |  |  |  |  |
Acquired receivable, gross contractual amount |  |  |  |  |  | $ 77,200,000 |  |  |  |  |
Post acquisition revenues |  |  |  |  |  |  |  |  |  | 196,200,000 |
Post acquisition income (loss) from continuing operations |  |  |  |  |  |  |  |  |  | (58,500,000) |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  | 8,600,000 |
Grass Valley [Member] | Inventories - Obsolescence and Other Valuation Allowances [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  | $ 6,900,000 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + 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 (c) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + 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 For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the fair value of the receivables acquired, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + 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 (b)(1) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + 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 (b)(2) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition This element represents the amount of earnings or loss 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=65885119&loc=d3e1392-128463 + 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=65885119&loc=d3e1392-128463 + Details
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- Definition Total costs related to goods produced and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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