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Restructuring - Schedule of Changes in Lease Termination Related Restructuring Reserves (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Restructuring Reserve [Roll Forward]        
Current year charges $ 215 $ 498 $ 350 $ 720
Lease Termination Restructuring Reserves [Member]        
Restructuring Reserve [Roll Forward]        
Accrued charges, beginning of period 577 926 767 1,394
Current year charges 203 475 325 585
Payments (333) (757) (645) (1,335)
Accrued charges, end of period $ 447 $ 644 $ 447 $ 644