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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Components of Income (Loss) Before Income Taxes

The components of income (loss) from continuing operations before income taxes were as follows (in thousands):

		Year Ended December 31,
		2015				2014				2013
Income (loss) from continuing operations before income taxes:
Domestic		$	244,955			$	263,357			$	472,816
Foreign			(16,280	)			163,242				115,504
Total		$	228,675			$	426,599			$	588,320

Provision for Income Taxes

The components of the provision for income taxes for continuing operations were as follows (in thousands):

		Year Ended December 31,
		2015				2014				2013
Current:
Federal		$	85,830			$	67,430			$	164,397
State			9,783				8,693				20,998
Foreign			21,262				39,978				37,193
Total current tax provision			116,875				116,101				222,588
Deferred:
Federal			(5,247	)			11,507				(22,611	)
State			917				2,232				(2,540	)
Foreign			(15,073	)			9,167				(562	)
Total deferred tax provision (benefit)			(19,403	)			22,906				(25,713	)
Total provision for income taxes from continuing operations		$	97,472			$	139,007			$	196,875

Effective Income Tax Rate Reconciliation

The actual income tax provision differed from the income tax provision computed by applying the U.S. federal statutory corporate rate to income from continuing operations before provision for income taxes as follows (in thousands):

		Year Ended December 31,
		2015				2014				2013
Provision at the statutory rate		$	80,036			$	149,697			$	205,912
Increases (decreases) resulting from —
State taxes			7,241				7,890				11,201
Foreign taxes			1,239				(13,059	)			(9,994	)
Contingency reserves, net			4,438				(650	)			(3,385	)
Production activity deduction			(6,871	)			(6,033	)			(10,247	)
Employee per diems, meals and entertainment			8,727				9,817				7,888
Taxes on unincorporated joint ventures			(3,838	)			(6,429	)			(6,786	)
Asset impairments			7,047				—				—
Other			(547	)			(2,226	)			2,286
Total provision for income taxes from continuing operations		$	97,472			$	139,007			$	196,875

Deferred Tax Assets and Liabilities

Deferred income taxes result from temporary differences in the recognition of income and expenses for financial reporting purposes and tax purposes. The tax effects of these temporary differences, representing deferred tax assets and liabilities, result principally from the following (in thousands):

		December 31,
		2015				2014
Deferred income tax liabilities:
Property and equipment		$	(189,793	)		$	(185,007	)
Goodwill			(69,059	)			(70,832	)
Other intangibles			(36,565	)			(48,344	)
Other book/tax accounting method differences			(61,095	)			(63,819	)
Total deferred income tax liabilities		$	(356,512	)			(368,002	)
Deferred income tax assets:
Accruals and reserves			25,070				20,835
Accrued insurance			75,591				64,745
Stock and incentive compensation and pension withdrawal liabilities			52,009				53,155
Net operating loss carryforwards			27,255				19,353
Other			10,894				10,194
Subtotal			190,819				168,282
Valuation allowance			(16,141	)			(13,028	)
Total deferred income tax assets			174,678				155,254
Total net deferred income tax liabilities		$	(181,834	)		$	(212,748	)

Net Deferred Income Tax Assets and Liabilities

The net deferred income tax assets and liabilities were comprised of the following (in thousands):

		December 31,
		2015				2014
Deferred income taxes:
Assets			4,657				3,233
Liabilities			(186,491	)			(215,981	)
Total net deferred income tax liabilities		$	(181,834	)		$	(212,748	)

Reconciliation of Unrecognized Tax Benefit

A reconciliation of unrecognized tax benefit balances is as follows (in thousands):

		December 31,
		2015				2014				2013
Balance at beginning of year		$	50,668			$	48,306			$	50,555
Additions based on tax positions related to the current year			5,340				9,133				8,984
Additions for tax positions of prior years			292				2,438				—
Reductions for tax positions of prior years			(132	)			—				—
Reductions for audit settlements			(1,345	)			—				—
Reductions resulting from a lapse of the applicable statute of limitations periods			(282	)			(9,209	)			(11,233	)
Balance at end of year		$	54,541			$	50,668			$	48,306

Balances of Unrecognized Tax Benefits

The balances of unrecognized tax benefits, the amount of related interest and penalties and what Quanta believes to be the range of reasonably possible changes in the next 12 months are as follows (in thousands):

		December 31,
		2015				2014				2013
Unrecognized tax benefits		$	54,541			$	50,668			$	48,306
Portion that, if recognized, would reduce tax expense and effective tax rate			48,312				42,952				40,029
Accrued interest on unrecognized tax benefits			8,750				6,304				5,766
Accrued penalties on unrecognized tax benefits			673				697				99
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months		$	0 to $27,485			$	0 to $10,221			$	0 to $6,554
Portion that, if recognized, would reduce tax expense and effective tax rate		$	0 to $24,009			$	0 to $8,484			$	0 to $4,816

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