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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |
Net short-term deferred tax asset | $ 0 | $ 13,600
Net long-term deferred tax asset | 2,400 | 2,800
Net short-term deferred tax liability | 0 | 100
Net long-term deferred tax liability | 76,447 | 73,322
Gross deferred tax assets related to state net operating loss carryforwards | 294,500 |
Valuation allowance related to certain state net operating loss carryforward deferred tax assets | 7,200 |
Liabilities recorded related to unrecognized tax benefits |  | 5,800
Liabilities related to interest and penalties | 900 | 1,100
Unrecognized tax benefit that would affect income tax rate if recognized | $ 3,300 | $ 2,600
State and Local Jurisdiction [Member] |  |
Income Taxes [Line Items] |  |
Operating loss expiration date | Net operating loss carryforwards that will expire between 2017 and 2036 |
Operating loss expiration, beginning year | 2017 |
Operating loss expiration, ending year | 2036 |
State and Local Jurisdiction [Member] | Tax Year 2016 [Member] |  |
Income Taxes [Line Items] |  |
Income tax examination year | 2016 |
State and Local Jurisdiction [Member] | Tax Year 2006 [Member] |  |
Income Taxes [Line Items] |  |
Income tax examination year | 2006 |
U.S. Federal Income Tax Authority [Member] | Internal Revenue Service [Member] | Tax Year 2013 [Member] |  |
Income Taxes [Line Items] |  |
Income tax examination year | 2013 |
U.S. Federal Income Tax Authority [Member] | Internal Revenue Service [Member] | Tax Year 2016 [Member] |  |
Income Taxes [Line Items] |  |
Income tax examination year | 2016 |

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