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Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Contingency [Line Items] |  |  |
Beginning balance | $ 17,384 | $ 27,522 | $ 16,363
Reductions | 0 | 0 | 0
Reductions | 0 | (11,110) | (742)
Settlements | 0 | 0 | 0
Lapses in statute of limitations | 0 | 0 | 0
Ending balance | 18,413 | 17,384 | 27,522
Federal [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax positions related to current year, Additions | 530 | 529 | 502
Tax positions related to prior year, Additions | 0 | 0 | 0
State [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax positions related to current year, Additions | 499 | 443 | 6,141
Tax positions related to prior year, Additions | 0 | 0 | 5,258
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=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + 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=65882285&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + 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)(4) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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