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Acquisitions - Additional Information (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] |  |  |  |  |  |  |
Payments to acquire business, net of cash acquired |  |  |  | $ 9,910 | $ 86,950 | $ 2,326 |
Precisive, LLC [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire business, net of cash acquired | $ 12,085 |  |  |  |  |  |
Business acquisition, cash acquired | 435 |  |  |  |  |  |
Business acquisition, deferred consideration payment | $ 2,600 |  |  |  |  |  |
Business acquisition, deferred consideration payment period | 15 months |  |  |  |  |  |
Business combination consideration price | $ 12,520 |  |  |  |  |  |
Granville-Phillips [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business combination consideration price |  |  |  |  |  |  | $ 86,950
Alter S.r.l [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire business, net of cash acquired |  | $ 2,426 | $ 2,058 |  |  |  |
Business acquisition, cash acquired |  | 21 |  |  |  |  |
Business combination consideration price |  | 2,447 |  |  |  |  |
Acquisition purchase price, net of cash acquired |  | $ 2,426 |  |  |  |  |
Acquisition date |  | Mar. 12, 2013 |  |  |  |  |

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