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Income Taxes - Valuation Allowances Recognized and Related Tax Effect (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal valuation allowance	$ 132,482	$ 775,304
Federal tax effect	46,369	271,356
State valuation allowance	434,561	264,188	$ 213,066
State tax effect	$ 23,521	$ 12,228	$ 11,099

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- Definition

Additional federal valuation allowance on net operating loss carryforwards and other federal tax assets.

+ References

No definition available.

+ Details

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- Definition

Additional state valuation allowance on net operating loss carryforwards.

+ References

No definition available.

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- Definition

Tax effect of additional federal valuation allowance on net operating loss carryforwards and other federal tax assets.

+ References

No definition available.

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- Definition

Tax effect of additional state valuation allowance on net operating loss carryforwards.

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No definition available.

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