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Debt - Additional Information (Detail) - Convertible Senior Notes |  | 3 Months Ended |
--- | --- | --- | ---
Apr. 17, 2017 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($)
Senior Notes Due 2017 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  | $ 95,000,000 |  | $ 95,000,000
Interest rate |  | 6.25% |  |
Convertible Senior Notes Due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  | $ 213,500,000 |  | $ 213,500,000
Interest rate |  | 5.50% |  |
Interest expense, debt |  | $ 4,700,000 | $ 700,000 |
Contractual interest coupon |  | 2,900,000 | 500,000 |
Amortization of debt discount |  | 1,500,000 | 200,000 |
Amortization of debt issuance costs |  | $ 300,000 | $ 0 |
Subsequent Event | Senior Secured Notes Due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount | $ 440,000,000 |  |  |
Interest rate | 10.75% |  |  |
Redemption price, percent of principal amount of notes redeemed | 100.00% |  |  |
Percent of notes with option to redeem | 35.00% |  |  |
Redemption price, percentage of principal amount | 110.75% |  |  |
Redemption price if required collateral coverage ratio not met, percentage of principal amount | 100.00% |  |  |
Minimum collateral coverage ratio | 1.50 |  |  |
Collateral coverage ratio, amount added to cash and cash equivalents | 4.75 |  |  |
Collateral coverage ratio, multiplier for Average Grantor EBITDA for seven most recent fiscal quarters | 4 |  |  |
Period to redeem notes without default if required collateral coverage ratio not met | 90 days |  |  |
Redemption price if company experiences change of control, percent of principal amount | 101.00% |  |  |
Subsequent Event | Senior Notes Due 2017 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 6.25% |  |  |

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