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Employee Benefit Plans - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended |  |  |
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Jun. 09, 2016 shares | Dec. 31, 2016 USD ($) Employees $ / shares shares | Sep. 30, 2016 USD ($) shares | Jul. 01, 2016 USD ($) | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Feb. 29, 2016 | Nov. 30, 2015 shares | Oct. 30, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefit Contributions |  |  | $ 0 |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | $ 11,800,000 |  |  | $ 11,800,000 |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  | 1 year 7 months 6 days |  |  |  |  |
Shares available for grant | shares |  | 3,912,000 |  |  | 3,912,000 | 6,150,000 |  |  |  |
Common stock, shares authorized | shares |  | 150,000,000 |  |  | 150,000,000 | 150,000,000 |  |  |  |
Additional shares authorized | shares |  |  |  |  | 2,000,000 |  |  |  |  |
Intrinsic value of options exercised |  |  |  |  | $ 100,000 | $ 1,700,000 | $ 800,000 |  |  |
Company discretionary employee match |  |  |  |  | 25.00% |  |  |  |  |
Employer contributions made |  |  |  |  | $ 400,000 | 400,000 | 400,000 |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay |  |  |  |  | 4.00% |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |  |  | $ 304,000 |  |  |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation |  | $ 3,300,000 |  |  | 3,300,000 |  |  |  |  |
Actuarial losses |  |  |  |  | $ 279,000 |  |  |  |  |
Net Accumulated Gain or Loss as a Percentage of Projected Plan Benefit Obligation |  |  |  |  | 10.00% |  |  |  |  |
Defined Benefit Plan, Curtailments |  |  |  |  | $ 1,955,000 |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  | 13,060,000 | $ 15,582,000 | $ 17,287,000 |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments |  |  |  |  | 1,955,000 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Employer contributions made |  |  |  |  | $ 1,000 |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Dividend yield |  |  |  |  | 0.00% | 0.00% | 0.00% |  |  |
Weighted-average fair value per share of option granted | $ / shares |  |  |  |  | $ 0.99 | $ 2.51 | $ 2.36 |  |  |
Fair value of options vested |  |  |  |  | $ 2,300,000 | $ 3,000,000 | $ 3,200,000 |  |  |
Total realized tax benefit |  |  |  |  | $ 0 | $ 0 | 15,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares |  | $ 6.01 |  |  | $ 6.01 | $ 6.56 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares |  | 0 |  |  | 0 |  |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | shares |  |  | 898,533 |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  | $ 2,800,000 | $ 600,000 | 0 |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  |  |  |  | $ 3.78 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  |  |  | $ 9,700,000 | $ 11,100,000 | $ 12,000,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares |  | 0 |  |  | 0 |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Discount Percentage On Purchase Of Stock |  |  |  |  | 15.00% |  |  |  |  |
Dividend yield |  |  |  |  | 0.00% | 0.00% | 0.00% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  |  |  |  | $ 1.04 | $ 1.69 | $ 1.79 |  |  |
Price at which stock options or ESPP may be granted |  |  |  |  | 85.00% |  |  |  |  |
Value Of Stock Purchase Right Percentage Of Put Option |  |  |  |  | 15.00% |  |  |  |  |
ESPP Employee Percentage of Payroll Deductions, Minimum |  | 1.00% |  |  | 1.00% |  |  |  |  |
ESPP Employee Percentage of Payroll Deductions, Maximum |  | 10.00% |  |  | 10.00% |  |  |  |  |
Common stock reserved for issuance | shares |  | 906,390 |  |  | 906,390 |  |  |  |  |
Common stock issued under the 2002 ESPP | shares |  |  |  |  | 1,265,458 | 888,152 | 440,040 |  |  |
Stock contributions value under 2002 ESPP |  |  |  |  | $ 3,700,000 | $ 5,200,000 | $ 2,700,000 |  |  |
1995 Stock Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Price at which stock options or ESPP may be granted |  |  |  |  | 100.00% |  |  |  |  |
Expiration period |  |  |  |  | 7 years |  |  |  |  |
Common stock reserved for issuance | shares |  | 12,029,588 |  |  | 12,029,588 |  |  |  |  |
Shares available for grant | shares |  | 3,501,498 |  |  | 3,501,498 |  |  |  |  |
Reduced the number of shares reserved for every unit granted |  |  |  |  | 1.5 |  |  |  |  |
Increased number of shares reserved for every unit forfeited |  |  |  |  | 1.5 |  |  |  |  |
Additional shares authorized | shares | 2,000,000 |  |  |  |  |  |  |  |  |
1995 Stock Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 2 years |  |  |  |  |
1995 Stock Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 4 years |  |  |  |  |
1995 Stock Plan [Member] | Prior To February 2006 [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Expiration period |  |  |  |  | 10 years |  |  |  |  |
1995 Stock Plan [Member] | Stock Options [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Price at which stock options or ESPP may be granted |  |  |  |  | 85.00% |  |  |  |  |
1995 Stock Plan [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares |  | $ 0 |  |  | $ 0 |  |  |  |  |
2002 Director Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Price at which stock options or ESPP may be granted |  |  |  |  | 100.00% |  |  |  |  |
Common stock reserved for issuance | shares |  | 643,244 |  |  | 643,244 |  |  |  |  |
Shares available for grant | shares |  | 409,244 |  |  | 409,244 |  |  |  |  |
Reduced the number of shares reserved for every unit granted |  |  |  |  | 1.5 |  |  |  |  |
Increased number of shares reserved for every unit forfeited |  |  |  |  | 1.5 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares |  |  |  |  |  |  |  |  | 2,350,000 | 2,000,000
2002 Director Plan [Member] | Options and Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |  |  |  |
Expiration period |  |  |  |  | 7 years |  |  |  |  |
2002 Director Plan [Member] | Options and Restricted Stock Units [Member] | Subsequent Grants [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 1 year |  |  |  |  |
2002 Director Plan [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares |  | $ 0 |  |  | $ 0 |  |  |  |  |
Assumed Omneon Stock Options [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance | shares |  | 121,043 |  |  | 121,043 |  |  |  |  |
TVN [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination Assumed Equity Benefit Plan |  |  |  |  |  |  |  | 2 |  |
Number of employees applied for VDP | Employees |  | 83 |  |  |  |  |  |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments |  |  |  |  | $ 2,000,000 |  |  |  |  |
TVN [Member] | Restricted Stock Units (RSUs) [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Additional shares authorized | shares |  |  |  |  | 1,750,000 |  |  |  |  |
Assumed Employee Equity Plans [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Other Payments to Acquire Businesses |  |  |  | $ 2,900,000 |  |  |  |  |  |
Euro Zone AA Rated [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  | 10 years |  |  |  |  |
Long-term Debt, Weighted Average Interest Rate |  | 1.50% |  |  | 1.50% |  |  |  |  |
Cost of Sales [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  | $ 1,554,000 | $ 1,862,000 | $ 2,359,000 |  |  |
Cost of Sales [Member] | TVN [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments |  |  |  |  | 600,000 |  |  |  |  |
Restructuring Charges [Member] | TVN [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments |  |  |  |  | $ 1,400,000 |  |  |  |  |

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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 For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Curtailment -URI http://asc.fasb.org/extlink&oid=6520938 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Curtailment -URI http://asc.fasb.org/extlink&oid=6520938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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