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Summary of Consolidated Statement of Cash Flows Detailed Adjustments (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]    
Net cash provided by operating activities $ 36,124 $ 4,755
Net cash provided by (used in) investing activities (10,510) (27,430)
As reported
   
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]    
Net cash provided by operating activities   6,319
Net cash provided by (used in) investing activities   (28,994)
As adjusted
   
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]    
Net cash provided by operating activities   (4,755)
Net cash provided by (used in) investing activities   27,430
Change
   
Schedule of Condensed Consolidating Statement of Cash Flows [Line Items]    
Net cash provided by operating activities   1,564
Net cash provided by (used in) investing activities   $ 1,564