Quarterly report pursuant to Section 13 or 15(d)

Accrued Liabilities Termination Benefit (Detail)

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Accrued Liabilities Termination Benefit (Detail) (Severance and Termination Benefit, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Severance and Termination Benefit
 
Schedule of Accrued Liabilities [Line Items]  
Balance, December 31, 2014 $ 1,765us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Payments made (57)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Balance, March 31, 2015 $ 1,708us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember