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Acquisitions (Zhongli) - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 15, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |
Earn out expenses |  | $ 24,213,000 | $ 32,670,000 | $ 24,268,000
Adjustments to fair value of earn-out payable |  | 4,218,000 | 11,222,000 |
Earn-out settled through exchange of accounts receivable |  | 3,272,000 |  |
Zhongli [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Equity interests acquired | 100.00% |  |  |
Consideration paid in cash for acquisition | $ 7,000,000 |  |  |
Earn out expenses | 0 | 21,943,000 | 26,951,000 | 16,997,000
Adjustments to fair value of earn-out payable | $ 17,100,000 | 6,485,000 | 11,222,000 |
Earn-out settled through exchange of accounts receivable |  | 3,200,000 |  |
Revenue from acquired entity |  | 30,400,000 | 28,200,000 | 100,000
Income (loss) from acquired entity |  | $ (2,100,000) | $ (6,000,000) | $ 0

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