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Employee Benefit Plans - Summary of Severance Associated with Cost Reduction Programs (Detail)
6 Months Ended
Jun. 30, 2015
USD ($)
Compensation And Retirement Disclosure [Abstract]  
Severance expenses payable, opening balance $ 6,274,000
Severance expense, net of reversals (607,000)
Severance payments (1,510,000)
Severance foreign currency translation (21,000)
Severance expenses payable, ending balance $ 4,136,000