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Income Taxes - Summary of Provision (Benefit) for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Current expense: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 21,037 us-gaap_CurrentFederalTaxExpenseBenefit | $ 12,711 us-gaap_CurrentFederalTaxExpenseBenefit | $ 5,680 us-gaap_CurrentFederalTaxExpenseBenefit
State |  |  |  |  |  |  |  |  | 5,753 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 463 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 35 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current expense |  |  |  |  |  |  |  |  | 26,790 us-gaap_CurrentIncomeTaxExpenseBenefit | 13,174 us-gaap_CurrentIncomeTaxExpenseBenefit | 5,715 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred expense: |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | (3,597)us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 8,197 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (25,911)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State |  |  |  |  |  |  |  |  | (333)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 1,401 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (26,501)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred expense |  |  |  |  |  |  |  |  | (3,830)us-gaap_DeferredIncomeTaxExpenseBenefit | 9,598 us-gaap_DeferredIncomeTaxExpenseBenefit | (52,412)us-gaap_DeferredIncomeTaxExpenseBenefit
Provision (benefit) for income taxes | $ 2,301 us-gaap_IncomeTaxExpenseBenefit | $ 5,368 us-gaap_IncomeTaxExpenseBenefit | $ 6,866 us-gaap_IncomeTaxExpenseBenefit | $ 7,844 us-gaap_IncomeTaxExpenseBenefit | $ 5,222 us-gaap_IncomeTaxExpenseBenefit | $ 6,582 us-gaap_IncomeTaxExpenseBenefit | $ 5,958 us-gaap_IncomeTaxExpenseBenefit | $ 4,970 us-gaap_IncomeTaxExpenseBenefit | $ 22,379 us-gaap_IncomeTaxExpenseBenefit | $ 22,732 us-gaap_IncomeTaxExpenseBenefit | $ (46,818)us-gaap_IncomeTaxExpenseBenefit

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- Definition Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Paragraph Question 1-7 + Details
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- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 + Details
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- Definition Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6510177 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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