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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Income Taxes [Line Items] |  |
Federal statutory rate | 35.00% | 35.00%
Income tax (benefit) expense | $ (44,038,000) | $ 22,366,000
Equity Compensation [Member] |  |
Income Taxes [Line Items] |  |
Income tax (benefit) expense | 3,600,000 |
Deferred compensation plan |  |
Income Taxes [Line Items] |  |
Income tax (benefit) expense | (96,000) | (2,000,000)
Valuation Allowance, Operating Loss Carryforwards | State |  |
Income Taxes [Line Items] |  |
Income tax (benefit) expense | $ 4,500,000 | $ 5,100,000

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: 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) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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