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Acquisitions - Summary of Final Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Oct. 19, 2015
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2014
Consideration:          
Property, plant and equipment     $ 59,100    
Goodwill     449,898 $ 450,311 $ 83,941
PEP [Member]          
Consideration:          
Cash paid   $ 621,196 621,196    
Cash adjustment   (1,635)      
Total consideration   619,561 621,196    
Current assets   69,783 69,331    
Property, plant and equipment   55,201 56,163    
Intangible assets subject to amortization   240,490 240,490    
Other non-current assets   1,500 1,500    
Goodwill   362,645 364,450    
Total assets acquired   729,619 731,934    
Current liabilities   21,131 21,131    
Non-current deferred tax liabilities   86,898 87,578    
Other non-current liabilities   2,029 2,029    
Total liabilities assumed   110,058 110,738    
Net assets acquired   $ 619,561 $ 621,196    
PEP [Member] | Subsequent Adjustments to Fair Value [Member]          
Consideration:          
Cash adjustment $ (1,635)        
Total consideration (1,635)        
Current assets 452        
Property, plant and equipment (962)        
Goodwill (1,805)        
Total assets acquired (2,315)        
Non-current deferred tax liabilities (680)        
Total liabilities assumed (680)        
Net assets acquired $ (1,635)