Restructuring - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Mar. 31, 2015
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred from inception to September 30, 2015	$ 85,966
MPI [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred from inception to September 30, 2015	$ 33,821
MPI [Member] | Legal and other advisor fees [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred from inception to September 30, 2015		$ 4,000