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Restructuring and Integration - Summary of Restructuring and Integration Charges (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]        
Severance and other costs   $ 228 $ 17 $ 1,535
Site closure and other associated costs $ 345 378 345 3,316
Total 345 $ 606 [1] 362 $ 4,851 [1]
Reserve beginning balance     2,625  
Charges     362  
Paid in     (1,747)  
Reserve ending balance 1,240   1,240  
Severance and Other Employee Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Reserve beginning balance     1,000  
Charges     17  
Paid in     (1,017)  
Site Closure Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Reserve beginning balance     1,625  
Charges     345  
Paid in     (730)  
Reserve ending balance $ 1,240   $ 1,240  
[1] Includes the effects of discontinued operations (Note 2) and prior periods' revisions (Note 1 and Note 15)