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Fair Value Measurement - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 05, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Expected volatility rate |  |  |  | 60.00% |  | 40.00%
Risk free interest rate |  |  |  | 1.10% |  | 0.60%
Expected probability of qualified acquisition |  |  |  | 50.00% |  | 90.00%
Qualified acquisition, expected term |  |  |  | 6 months |  | 6 months
Net income attributable to common and participating stockholders |  | $ 33,911 | $ (21,145) | $ 21,376 | $ 47,814 |
Increase decrease in estimated net income (loss) if percentage of closing stock price ten percent lower |  |  |  | 39,100 |  |
Increase decrease in estimated net income (loss) if percentage of closing stock price ten percent higher |  |  |  | 3,800 |  |
Volatility Assumption [Member] |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Increase decrease in estimated net income (loss) if percentage of closing stock price ten percent lower |  |  |  | 24,400 |  |
Increase decrease in estimated net income (loss) if percentage of closing stock price ten percent higher |  |  |  | 18,100 |  |
Transaction Occurring Assumption [Member] |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Increase decrease in estimated net income (loss) if percentage of closing stock price ten percent lower |  |  |  | 1,000 |  |
Increase decrease in estimated net income (loss) if percentage of closing stock price ten percent higher |  |  |  | $ 43,800 |  |
Maximum [Member] |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Percentage of closing stock price |  |  |  | 10.00% |  |
Estimated net income |  |  |  | $ 17,700 |  |
Maximum [Member] | Volatility Assumption [Member] |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Percentage of closing stock price |  |  |  | 10.00% |  |
Estimated net income |  |  |  | $ 3,000 |  |
Maximum [Member] | Transaction Occurring Assumption [Member] |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Percentage of closing stock price |  |  |  | 10.00% |  |
Estimated net income |  |  |  | $ 22,400 |  |
Minimum [Member] |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Percentage of closing stock price |  |  |  | 10.00% |  |
Estimated net income |  |  |  | $ 17,600 |  |
Minimum [Member] | Volatility Assumption [Member] |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Percentage of closing stock price |  |  |  | 10.00% |  |
Estimated net income |  |  |  | $ 3,300 |  |
Minimum [Member] | Transaction Occurring Assumption [Member] |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Percentage of closing stock price |  |  |  | 10.00% |  |
Estimated net income |  |  |  | $ 22,400 |  |
Redeemable Convertible Series B Preferred Stock [Member] |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Capital | $ 600,000 |  |  |  |  |
Redeemable Convertible preferred stock, shares issued | 600,000 | 600,000 |  | 600,000 |  | 600,000
Preferred stock liquidation preference per share | $ 1,000 |  |  |  |  |
Preferred stock dividend rate calculated on interest rate | 3.00% |  |  |  |  |
Conversion ceiling price of common stock |  | $ 2.25 |  | $ 2.25 |  |
Conversion floor price of common stock |  | 1.75 |  | 1.75 |  |
Redeemable Convertible Series B Preferred Stock [Member] | Maximum [Member] |  |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |  |
Conversion ceiling price of common stock |  | $ 2.25 |  | $ 2.25 |  |

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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1377-109256 + Details
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- Definition The per share liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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