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Debt - January 2017 Exchangeable Senior Notes - Additional Information (Detail) |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 20, 2017 USD ($) d $ / shares | Jan. 19, 2017 $ / shares | Sep. 30, 2017 USD ($) shares | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Debt Disclosure [Line Items] |  |  |  |  |
Interest |  |  | $ 12,536,000 | $ 13,839,000 |
Convertible Debt |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Convertible senior notes, stated interest rate |  |  | 3.50% |  |
Convertible notes, interest expense |  |  |  | 6,900,000 |
Accrued interest on convertible note |  |  | $ 0 |  | $ 200,000
Interest |  |  | 300,000 | 2,500,000 |
Convertible Debt | Non Cash |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Convertible notes, interest expense |  |  |  | $ 4,000,000 |
Convertible Debt | 2017 Notes |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Convertible senior notes, principal amount | $ 30,000,000 |  | $ 30,000,000 |  |
Convertible senior notes, stated interest rate | 3.50% |  |  |  |
Convertible senior notes, due date | 2047 |  |  |  |
Convertible senior notes, repurchase price at option of the issuer | 100.00% |  |  |  |
Net proceeds from offering | $ 28,800,000 |  |  |  |
Convertible senior notes, interest payable dates | payable semi-annually in arrears on January 15 and July 15 of each year, beginning on July 15, 2017 |  |  |  |
Convertible senior notes, payment start date | Jul. 15, 2017 |  |  |  |
Convertible senior notes, maturity date | Jan. 15, 2047 |  |  |  |
Convertible senior notes, percentage of premium initial exchange price |  | 35.00% |  |  |
Convertible senior notes, total ADS into which the debt is exchangeable | shares |  |  | 7,716,048 |  |
Value of shares in excess of principal value of Notes based on closing price |  |  | $ 0 |  |
Convertible senior notes, redemption start date | Jan. 19, 2021 |  |  |  |
Convertible senior notes redemption, end date | Jan. 15, 2047 |  |  |  |
Convertible senior notes, mandatory exchange in whole or in part if daily VWAP equals or exceeds percentage of exchange price | 130.00% |  |  |  |
Convertible senior notes, mandatory exchange in whole or in part if daily VWAP, stock trigger price | $ / shares | $ 5.05 |  |  |  |
Convertible senior notes, mandatory exchange in whole or in part if daily VWAP equals or exceeds percentage of exchange price, at least number of VWAP Trading days | d | 20 |  |  |  |
Convertible senior notes, mandatory exchange in whole or in part if daily VWAP equals or exceeds percentage of exchange price, in any number of VWAP Trading days | d | 30 |  |  |  |
Convertible senior notes, discount | $ 1,200,000 |  | 1,100,000 |  |
Convertible notes, carrying amount net of unamortized discount |  |  | 28,900,000 |  |
Convertible notes, interest expense |  |  | 900,000 |  |
Interest expense, contractual coupon interest |  |  | 700,000 |  |
Accrued interest on convertible note |  |  | 200,000 |  |
Interest |  |  | 500,000 |  |
Convertible Debt | 2017 Notes | Minimum |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Percentage of holders of principal amount required to issue notice on default | 25.00% |  |  |  |
Convertible Debt | 2017 Notes | Maximum | Non Cash |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Convertible notes, interest expense |  |  | $ 100,000 |  |
Convertible Debt | 2017 Notes | American Depositary Shares |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Convertible senior notes, exchange rate of ADS per $1,000 principal amount of notes | 257.2016 |  |  |  |
Convertible senior notes, initial exchange price | $ / shares | $ 3.89 | $ 2.88 |  |  |

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