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Accrued Liabilities - Summary of Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accrued Liabilities Current [Abstract]
Accrued wages, bonuses and commissions	$ 30,977	$ 25,471
Other accrued liabilities	8,531us-gaap_OtherAccruedLiabilitiesCurrent	7,368us-gaap_OtherAccruedLiabilitiesCurrent
Accrued liabilities	$ 39,508us-gaap_AccruedLiabilitiesCurrent	$ 32,839us-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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