Contingencies - Additional Information (Detail)
$ in Thousands
Sep. 30, 2015
|Commitment And Contingencies [Line Items]|
|Fine paid by for retention and use of individual agent in Nigeria with respect to customs-related issues||$ 11,760|
Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.
Reference 1: http://www.xbrl.org/2003/role/presentationRef