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Related Party Transactions (Narrative) (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 15, 2014
Jun. 28, 2012
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2015
Jun. 30, 2014
Related Party Transaction [Line Items]              
Due from related parties     $ 0.1     $ 0.6 $ 0.1
Unsecured Debt [Member] | 10.125% Senior Notes due 2020 [Member]              
Related Party Transaction [Line Items]              
Interest rate     10.125%     10.125% 10.125%
Maturity date           2020 2020
CII [Member]              
Related Party Transaction [Line Items]              
Percentage of common stock outstanding           4.00%  
Authorized non-liquidating cash distribution         $ 10.0    
Non-liquidating distribution to common unit holders made by subsidiary to parent company     $ 9.0 $ 3.0 $ 10.0    
Non-cash settlement of note receivable from stock holder     22.0        
Outstanding notes receivable           $ 0.0  
O V S [Member]              
Related Party Transaction [Line Items]              
Due from related parties     $ 0.1     0.6 $ 0.1
Dan Caruso [Member] | Aircraft Reimbursement [Member]              
Related Party Transaction [Line Items]              
Payable to related party settled           0.7 $ 0.1
Matt Erickson [Member] | Unsecured Debt [Member] | 10.125% Senior Notes due 2020 [Member]              
Related Party Transaction [Line Items]              
Amount due to related parties   $ 0.6       $ 0.4  
Interest rate   10.125%          
Maturity date   2020          
Redemption of notes to related party $ 0.2