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Earnings Per Share - Schedule of Numerator and Denominator Used in Computation of Earnings Per Share (Detail) - USD ($)
$ in Thousands
 8 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Numerator:          
Loss from continuing operations before discontinued operations attributable to common stockholders $ (6,018) $ (12,969) $ (23,001) $ (49,662)  
Number of shares outstanding, end of period:          
Unvested restricted stock (159,000) (115,000) (130,000) (134,000)  
Effect of weighted average shares outstanding (154,000) (295,000) (124,000) (5,501,000)  
Weighted average common shares outstanding 40,262,000 40,642,000 39,820,000 34,015,000  
Antidilutive potentially issuable shares 2,178,000 2,259,000 2,190,000 2,074,000  
Class A Common Stock [Member]          
Number of shares outstanding, end of period:          
Common stock shares outstanding 39,587,000 40,064,000 39,086,000 38,662,000 25,991,000
Class B Common Stock [Member]          
Number of shares outstanding, end of period:          
Common stock shares outstanding 988,000 988,000 988,000 988,000 988,000