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Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Contingency [Line Items] |  |  |
Beginning balance | $ 18,413 | $ 17,384 | $ 27,522
Reductions | 0 | 0 | 0
Reductions | (802) | 0 | (11,110)
Settlements | 0 | 0 | 0
Lapses in statute of limitations | 0 | 0 | 0
Ending balance | 20,483 | 18,413 | 17,384
Federal [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax positions related to current year, Additions | 1,206 | 530 | 529
Tax positions related to prior year, Additions | 0 | 0 | 0
State [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax positions related to current year, Additions | 1,666 | 499 | 443
Tax positions related to prior year, Additions | 0 | 0 | 0
Foreign [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax positions related to prior year, Additions | $ 0 | $ 0 | $ 0

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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