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Goodwill - Additional Information (Detail) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015 | Jul. 06, 2015 | Dec. 31, 2014 | Oct. 04, 2010
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Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 95,280,000 | $ 81,448,000 |  | $ 77,388,000 |
Sisd [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  | $ 4,301,000 |  |
MVSD [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Fair value in excess to carrying value |  |  |  |  | 208.00%

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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