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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
Consideration: |  |  |
Goodwill |  | $ 448,254 | $ 449,898
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) |  |

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