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Business Combinations - Additional Information (Detail) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 | Apr. 01, 2016 | Mar. 31, 2016 | Apr. 01, 2015
Business Acquisition [Line Items] |  |  |  |
Aggregate purchase price of acquisitions | $ 489,720 |  |  |
Payments to Acquire Businesses, Gross | 0 |  |  |
Goodwill assigned | 429,000 |  |  |
Estimated acquisition earn-out payables | 57,408,000 | $ 63,821,000 | $ 69,095,000 | $ 78,387,000
Accounts payable |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | 35,300,000 |  |  |
Other non-current liability |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | $ 22,100,000 |  |  |

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