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Income Taxes - Carryforwards Available to Reduce Future Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Carryforward Available To Reduce Future Income Taxes [Line Items]
Alternative minimum tax credits carryforward	$ 20,435	$ 20,435
U.S. Federal
Carryforward Available To Reduce Future Income Taxes [Line Items]
Net operating loss, Years of Expiration Carryforward	2017 – 2036
Net operating loss, Tax Credit Carryforward, Amount	$ 745,190
State Taxes
Carryforward Available To Reduce Future Income Taxes [Line Items]
Net operating loss, Years of Expiration Carryforward	2020 – 2036
Net operating loss, Tax Credit Carryforward, Amount	$ 1,521,847
Years of Expiration Carryforward Unlimited
Carryforward Available To Reduce Future Income Taxes [Line Items]
Alternative minimum tax credits carryforward	$ 20,435