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Redeemable Noncontrolling Interests - Additional Information (Detail) - Aipu Group $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 | Dec. 31, 2015 Tranche | May 31, 2014
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Business acquisition, equity interests acquired |  |  |  |  | 50.00%
Number of tranches | Tranche |  |  |  | 3 |
Business acquisition, equity interests held by non controlling interest holders maximum percentage of eligible shares to be put each year by option exercise right |  |  | 11.00% | 28.00% |
Number of shares transferred | shares | 2 |  |  |  |
Description of ownership after transfer of shares |  | However, as the Written Put Option outstanding is legally detachable and separately exercisable from the 50% minus one share of equity interest in Aipu Group held by the Company, the Written Put Option qualifies as a freestanding financial instrument as defined under ASC 480 is accounted for as a derivative liability pursuant to ASC 815. |  |  |
Ownership percentage after transaction |  | 50.00% |  |  |
Floor |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Financial and operational performance targeted amount used to compute put option exercise price |  | $ 700,000 |  |  |
Ceiling |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Financial and operational performance targeted amount used to compute put option exercise price |  | $ 800,000 |  |  |

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