Accrued Liabilities - Summary of Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Payables And Accruals [Abstract]
Employee benefits	$ 8,278us-gaap_AccruedEmployeeBenefitsCurrent	$ 7,653us-gaap_AccruedEmployeeBenefitsCurrent
Professional fees and settlements	951	1,855
Other	1,633us-gaap_OtherLiabilitiesCurrent	1,642us-gaap_OtherLiabilitiesCurrent
Total	$ 10,862us-gaap_AccruedLiabilitiesCurrent	$ 11,150us-gaap_AccruedLiabilitiesCurrent

Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. 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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Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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