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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
	May 14, 2014	Dec. 31, 2013	Apr. 03, 2015	May 14, 2014	Apr. 24, 2012
Stockholders' Equity Note [Abstract]
Authorized stock repurchase value		$ 220us-gaap_StockRepurchaseProgramAuthorizedAmount1		$ 300us-gaap_StockRepurchaseProgramAuthorizedAmount1	$ 25us-gaap_StockRepurchaseProgramAuthorizedAmount1
Increase in stock repurchase program	80hlit_StockRepurchaseProgramIncreaseOfCommonStockRepurchaseAuthorization	195hlit_StockRepurchaseProgramIncreaseOfCommonStockRepurchaseAuthorization
Stock Repurchased and Retired During Period, Shares			37.9us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Weighted average purchase price per share			$ 6.23hlit_StockRepurchasedAndRetiredDuringPeriodSharesAverageCostPerShare
Stock Repurchased and Retired During Period, Value			237.5us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Stock Repurchased and Retired During Period, Expenses			1.0hlit_StockRepurchasedandRetiredDuringPeriodExpenses
Remaining authorized repurchase amount			$ 63.5us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

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- Definition

Stock Repurchased and Retired During Period, Expenses

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- Definition

Stock Repurchased And Retired During Period Shares Average Cost Per Share

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- Definition

Increase Of Common Stock Repurchase Authorization

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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

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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

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Amount of stock repurchase plan authorized.

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- Definition

Amount remaining of a stock repurchase plan authorized.

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