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Income Taxes - Effective Income Tax Rate Reconciliation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Provision at the statutory rate	$ 223,737	$ 162,603	$ 67,727
Increases (decreases) resulting from -
State taxes	14,788	10,980	6,375
Foreign taxes	(9,994)	(5,841)	(2,815)
Contingency reserves, net	(3,422)	(3,880)	(7,262)
Production activity deduction	(10,247)	(7,081)	(2,394)
Employee per diems, meals and entertainment	7,960	6,441	4,149
Taxes on unincorporated joint ventures	(6,786)	(5,609)	(4,142)
Other	1,904	1,246	1,458
Total provision for income taxes	$ 217,940	$ 158,859	$ 63,096

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Income tax reconciliation, taxes on unincorporated joint venture.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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