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Goodwill - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Goodwill [Line Items]      
Goodwill impairment charge $ 283,700 $ 0 [1] $ 0 [2]
[1] The total carrying amount of goodwill at March 31, 2015 and September 30, 2015 is net of accumulated impairment charges of $370.9 million.
[2] The total carrying amount of goodwill at September 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.