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Income Taxes - Summary of Differences In Effective Tax Rate and Federal Statutory Rate Due to State Income Taxes, Equity Compensation and Other Tax Items (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Total (loss) income before income taxes | $ (108,354) | $ 127,201 | $ (16,440) | $ 409,707
U.S. federal statutory rate | 21.00% | 35.00% | 21.00% | 35.00%
Total tax (benefit) expense at statutory rate | $ (22,754) | $ 44,520 | $ (3,452) | $ 143,397
State and local income taxes, net of federal benefit | (3,745) | 4,146 | 749 | 13,128
Non-deductible executive compensation | 291 | 0 | 553 | 140
Equity compensation | 1,476 | 2,228 | 2,140 | 4,752
Change in valuation allowances: |  |  |  |
Federal net operating loss carryforwards & other | 0 | 2,562 | 0 | 3,418
State net operating loss carryforwards & other | (2,042) | 4,127 | 13,636 | 6,212
Rabbi trust and other | 18 | 68 | 1,399 | (1,053)
Permanent differences and other | (1,762) | 0 | (867) | 52
Total (benefit) expense for income taxes | $ (28,518) | $ 57,651 | $ 14,158 | $ 170,046
Effective tax rate | 26.30% | 45.30% | (86.10%) | 41.50%

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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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