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Income Taxes - Summary of Differences In Effective Tax Rate and Federal Statutory Rate Due to State Income Taxes and Other Tax Items (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Income Tax Disclosure [Abstract] |  |  |  |
Total income (loss) before income taxes | $ 127,201 | $ (354,424) | $ 409,707 | $ (490,172)
U.S. federal statutory rate | 35.00% | 35.00% | 35.00% | 35.00%
Total tax expense (benefit) at statutory rate | $ 44,520 | $ (124,048) | $ 143,397 | $ (171,560)
State and local income taxes, net of federal benefit | 4,146 | (11,524) | 13,128 | (15,956)
Non-deductible executive compensation | 0 | 446 | 140 | 682
Tax less than book equity compensation | 2,228 | 64 | 4,752 | 5,330
Change in valuation allowances: |  |  |  |
Federal net operating loss carryforwards & other | 2,562 | 3,209 | 3,418 | 0
State net operating loss carryforwards & other | 4,127 | 2,327 | 6,212 | 7,699
Rabbi trust and other | 68 | 0 | (1,053) | 2,276
Permanent differences and other | 0 | 38 | 52 | 65
Total income tax expense (benefit) | $ 57,651 | $ (129,488) | $ 170,046 | $ (171,464)
Effective tax rate | 45.30% | 36.50% | 41.50% | 35.00%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: 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=84230637&loc=d3e32698-109319 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: 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=84230637&loc=d3e32687-109319 + Details
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