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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended | 35 Months Ended |  |
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May 14, 2014 | Dec. 31, 2013 | Apr. 03, 2015 | May 14, 2014 | Apr. 24, 2012
Stockholders' Equity Note [Abstract] |  |  |  |  |
Authorized stock repurchase value |  | $ 220 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  | $ 300 us-gaap_StockRepurchaseProgramAuthorizedAmount1 | $ 25 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Increase in stock repurchase program | 80 hlit_StockRepurchaseProgramIncreaseOfCommonStockRepurchaseAuthorization | 195 hlit_StockRepurchaseProgramIncreaseOfCommonStockRepurchaseAuthorization |  |  |
Stock Repurchased and Retired During Period, Shares |  |  | 37.9 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares |  |
Weighted average purchase price per share |  |  | $ 6.23 hlit_StockRepurchasedAndRetiredDuringPeriodSharesAverageCostPerShare |  |
Stock Repurchased and Retired During Period, Value |  |  | 237.5 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |
Stock Repurchased and Retired During Period, Expenses |  |  | 1.0 hlit_StockRepurchasedandRetiredDuringPeriodExpenses |  |
Remaining authorized repurchase amount |  |  | $ 63.5 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |

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- Definition Stock Repurchased and Retired During Period, Expenses + References No definition available. + Details
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- Definition Increase Of Common Stock Repurchase Authorization + References No definition available. + Details
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- Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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