Annual report pursuant to Section 13 and 15(d)

Goodwill - Reconciliation of Changes to Carrying Amount of Goodwill (Detail)

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Goodwill - Reconciliation of Changes to Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Goodwill [Roll Forward]      
Goodwill Beginning Balance $ 42,268 $ 42,268 $ 42,268
Adjustments 0 0 0
Goodwill Ending Balance 42,268 42,268 42,268
O&O      
Goodwill [Roll Forward]      
Goodwill Beginning Balance 42,268 42,268 42,268
Adjustments 0 0 0
Goodwill Ending Balance $ 42,268 $ 42,268 $ 42,268