Taxes - Tax Effects of Significant Items of Deferred Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Alternative minimum tax credit	$ 2,100
Deferred tax liabilities:
Tax on unremitted earnings of foreign subsidiaries	(89,900)
Foreign [Member]
Deferred tax assets:
Operating loss carryforwards	58,051	54,231
Oil and gas properties	1,606
Total deferred tax assets	59,657	54,231
Deferred tax liabilities:
Accrued income		(1,005)
Total deferred tax liabilities		(1,005)
Net deferred tax asset (liability)	59,657	53,226
Valuation allowance	(59,576)	(52,427)
Net deferred tax asset (liability) after valuation allowance	81	799
United States And Other [Member]
Deferred tax assets:
Operating loss carryforwards	2,928	4,498
Stock-based compensation	8,056	8,091
Accrued compensation	598	739
Oil and gas properties	1,015
Alternative minimum tax credit	4,501	2,261
Other	145	861
Total deferred tax assets	17,243	16,450
Deferred tax liabilities:
Tax on unremitted earnings of foreign subsidiaries	(89,900)
Prepaids	(198)	(373)
Other liabilities	(82)	(35)
Fixed assets	(12)	(28)
Total deferred tax liabilities	(90,192)	(436)
Net deferred tax asset (liability)	(72,949)	16,014
Valuation allowance		(15,992)
Net deferred tax asset (liability) after valuation allowance	$ (72,949)	$ 22