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Income Taxes - Differences between Total Income Tax Expense and Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Computed “expected” Federal income tax expense	$ 21,343	$ 53,415	$ 42,304
(Decrease) increase in income taxes resulting from:
State income taxes, net	(460)	8,118	3,138
Foreign non-taxed income, rate differential	(7,609)	(5,453)	(2,647)
Other adjustments, net	323	(3,355)	2,593
Total income tax expense (benefit)	$ 13,597	$ 52,725	$ 45,388

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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 expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit).

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