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Acquisitions - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 17, 2015 | Mar. 12, 2013 | Jun. 30, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | May. 30, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  | $ 199,703 | $ 192,381 | $ 150,909 |
Total purchase price, net of cash acquired |  |  |  | 9,910 | 86,950 | $ 2,326 |
Precisive, LLC [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets | $ 693 |  |  |  |  |  |
Non-current assets | 18 |  |  |  |  |  |
Intangible assets | 5,110 |  |  |  |  |  |
Goodwill | 7,042 |  |  | $ 7,042 |  |  |
Total assets acquired | 12,863 |  |  |  |  |  |
Total current liabilities assumed | (343) |  |  |  |  |  |
Total purchase price | 12,520 |  |  |  |  |  |
Less cash acquired | (435) |  |  |  |  |  |
Total purchase price, net of cash acquired | $ 12,085 |  |  |  |  |  |
Granville-Phillips [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Inventory |  |  |  |  |  |  | $ 5,198
Property and equipment |  |  |  |  |  |  | 299
Intangible assets |  |  |  |  |  |  | 38,850
Goodwill |  |  |  |  | $ 41,612 |  | 42,587
Other assets |  |  |  |  |  |  | 191
Warranty liability |  |  |  |  |  |  | (175)
Total purchase price |  |  |  |  |  |  | $ 86,950
Alter S.r.l [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets |  | $ 1,053 |  |  |  |  |
Property and equipment |  | 211 |  |  |  |  |
Intangible assets |  | 2,806 |  |  |  |  |
Goodwill |  | 381 |  |  |  |  |
Other assets |  | 67 |  |  |  |  |
Total assets acquired |  | 4,518 |  |  |  |  |
Debt (Note 15) |  | 770 |  |  |  |  |
Deferred taxes and other liabilities |  | 1,301 |  |  |  |  |
Total liabilities assumed |  | 2,071 |  |  |  |  |
Total purchase price |  | 2,447 |  |  |  |  |
Less cash acquired |  | (21) |  |  |  |  |
Total purchase price, net of cash acquired |  | $ 2,426 | $ 2,058 |  |  |  |

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