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Acquisitions - Summary of Initial Consideration Paid for Acquisitions (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2014 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |
Fair value of assets acquired | $ 60,104 |  |
Less liabilities assumed | (5,805) |  |
Net assets acquired | 54,299 |  |
Less cash acquired |  |  | $ (1,277)
Cash paid |  | $ 34,396 | $ 44,122
Professional Power Products, Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of assets acquired |  | 60,104 |
Less liabilities assumed |  | (5,805) |
Net assets acquired |  | 54,299 |
Less value of shares of Company common stock expected to be issued at date of acquisition |  | (8,900) |
Less cash acquired | (1,300) | (1,277) |
Cash paid | $ 45,400 | $ 44,122 |

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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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