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Quarterly Results Quarterly Results (Unaudited) - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |
Net foreign currency gain |  |  | $ 7,955 | $ 7,820 | $ 1,517
Egypt, Pounds |  |  |  |  |
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |
Net foreign currency gain | $ 6,000 |  |  |  |
Recovery of Legal and Related Fees |  |  |  |  |
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |
Other |  | $ 6,000 |  |  |

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