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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands |  |  |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2009 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |
Income tax provision (benefit) |  |  |  |  |  | $ 11,225 | $ (29,515) | $ 9,361 | $ (27,494)
Unrecognized Tax Benefits, Period Increase (Decrease) |  |  |  |  |  |  |  | 500 |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued |  |  |  |  |  | 800 |  | 800 |
Unrecognized Tax Benefits, Income Tax Penalties Accrued |  |  |  |  |  | $ 200 |  | $ 200 |
Domestic Tax Authority [Member] |  |  |  |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |
Open Tax Year |  |  | 2013 |  |  |  |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |
Open Tax Year |  |  |  | 2012 |  |  |  |  |
Income Tax Examination, Year under Examination | 2015 | 2014 |  |  |  |  |  |  |
Foreign Tax Authority [Member] |  |  |  |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |
Open Tax Year |  |  |  |  | 2009 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  |  |  | 21.00% |
Maximum [Member] |  |  |  |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  |  |  | 35.00% |

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