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Subsequent Events - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 0 Months Ended |  | 0 Months Ended
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Sep. 30, 2013 | Sep. 30, 2013 | Nov. 03, 2014 Subsequent Event [Member] | Nov. 03, 2014 Subsequent Event [Member] | Nov. 03, 2014 Subsequent Event [Member] Emtrol LLC [Member] | Nov. 04, 2014 Subsequent Event [Member] Zhongli Industrial Technology Company Ltd [Member]
Subsequent Event [Line Items] |  |  |  |  |  |
Membership interest acquired |  |  |  |  | 100.00% |
Consideration paid in cash for acquisition |  |  | $ 32,000,000 |  |  |
Shares issued for acquired subsidiary |  |  | 454,000 |  |  |
Value of shares issued to subsidiary |  |  |  | 6,000,000 |  |
Annual revenue of subsidiary | $ 65,062,000 | $ 195,419,000 |  |  |  | $ 28,000,000

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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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