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Goodwill - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2015
 [1]
Dec. 31, 2014
Jun. 30, 2014
 [2]
Goodwill [Line Items]      
Goodwill impairment charge $ 0 $ 283,700 $ 0
[1] The total carrying amount of goodwill at June 30, 2015 is net of accumulated impairment charges of $370.9 million.
[2] The total carrying amount of goodwill at June 30, 2014 is net of accumulated impairment charges $30.9 million and $56.3 million related to the Middle East/North Africa and Asia/Pacific segments, respectively.