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Balance Sheet Information - Summary of Other Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]
Accrued payroll and other employee costs	$ 9,578	$ 13,404
Accrued material purchases	4,251htwr_AccruedMaterialPurchases	4,284htwr_AccruedMaterialPurchases
Accrued warranty	4,815	4,685	4,262	2,498
Accrued research and development costs	2,772htwr_AccruedResearchAndDevelopmentCosts	2,663htwr_AccruedResearchAndDevelopmentCosts
Other accrued expenses	12,255us-gaap_OtherAccruedLiabilitiesCurrent	11,553us-gaap_OtherAccruedLiabilitiesCurrent
Total other accrued liabilities	$ 33,671us-gaap_AccruedLiabilitiesCurrent	$ 36,589us-gaap_AccruedLiabilitiesCurrent

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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