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Restructuring Charges - Accrual for Severance and Related Costs (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Restructuring And Related Activities [Abstract]    
Balance, Beginning of Period $ 2,170 $ 8,686
Payments (917) (1,889)
Non-cash Adjustments [1] (79) (173)
Balance, End of Period $ 1,174 $ 6,624
[1] Includes cancellations due to employee departures prior to agreed upon end dates, employee transfers to open positions within the organization and subsequent adjustments to severance and related costs.