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Summary Of Significant Accounting Policies (Rollforward Analysis Of The Allowance Against Accounts Receivable Balance) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Allowance for Bad Debt, Beginning Balance | $ (10,031) | $ (7,631) | $ (6,069)
Allowance for Bad Debt, Charged to costs and expenses | (2,699) | (2,400) | (1,562)
Allowance for Bad Debts, Foreign currency gain | 880 |  |
Allowance for Bad Debt, Ending Balance | (11,850) | (10,031) | $ (7,631)
Gabon [Member] |  |  |
Allowance for Bad Debt, Charged to costs and expenses | $ (2,700) | $ (2,400) |

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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