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Severance and Other Charges - Summary of Activity Related to Accrued Severance Charges by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Restructuring and Related Activities [Abstract]  
Restructuring Reserve, Beginning Balance $ 1,904us-gaap_RestructuringReserveCurrent
Payments (591)us-gaap_PaymentsForRestructuring
Restructuring Reserve, Ending Balance $ 1,313us-gaap_RestructuringReserveCurrent