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Quarterly Financial Information - Summary of Quarterly Financial Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 2 Months Ended 3 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Oct. 31, 2014
Jul. 31, 2014
Apr. 30, 2014
Jan. 31, 2014
Oct. 31, 2013
Jul. 31, 2013
Apr. 30, 2013
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Dec. 31, 2014
Dec. 31, 2015
Apr. 30, 2014
Apr. 30, 2013
Text Block [Abstract]                                      
Revenues $ 85,646 $ 140,024 $ 146,185 $ 143,714 $ 116,577 $ 141,341 $ 141,387 $ 118,927 $ 117,852 $ 132,296 $ 128,558 $ 108,694 $ 112,167 $ 116,836 $ 117,638 $ 368,374 $ 546,500 $ 497,633 $ 455,335
Operating income (loss) 2,708 4,702 12,696 11,342 3,126 10,064 9,338 (5,973) (1,298) 9,450 9,737 2,110 78 4,426 5,807 22,110 31,866 11,916 12,421
Net (loss) income (6,017) (7,020) 2,259 943 (7,963) 361 (154) (15,633) (11,033) (575) (163) (13,518) (11,474) (21,092) (8,379) (5,810) (11,781) (27,404) (54,463)
(Loss) income attributable to common stockholders from continuing operations (5,987) (7,019) 2,296 1,025 (9,271) 259 (290) (11,815) (10,750) (294) (142) (9,696) (11,079) (20,732) (8,155) (5,810) (11,781) (27,310) (49,983)
Net (loss) income attributable to common stockholders $ (5,987) $ (7,019) $ 2,296 $ 1,025 $ (9,271) $ 259 $ (290) $ (11,815) $ (10,750) $ (339) $ (191) $ (13,397) $ (11,407) $ (20,967) $ (8,371) $ (6,018) $ (12,969) $ (23,095) $ (54,142)
Basic and diluted:                                      
Loss attributable to common stockholders from continuing operations $ (0.15) $ (0.17) $ 0.06 $ 0.03 $ (0.23) $ 0.01 $ (0.01) $ (0.30) $ (0.27) $ (0.01) $ 0.00 $ (0.25) $ (0.28) $ (0.67) $ (0.30) $ (0.15) $ (0.32) $ (0.58) $ (1.46)
Net loss attributable to common stockholders (0.15) (0.17) 0.06 0.03 (0.23) 0.01 (0.01) (0.30) (0.27) (0.01) 0.00 (0.34) (0.29) (0.68) (0.31) (0.15) (0.32) (0.58) (1.59)
(Loss) income attributable to common stockholders from continuing operations (0.15) (0.17) 0.06 0.03 (0.23) 0.01 (0.01) (0.30) (0.27) (0.01) 0.00 (0.25) (0.28) (0.67) (0.30) (0.15) (0.32) (0.58) (1.46)
Net (loss) income attributable to common stockholders $ (0.15) $ (0.17) $ 0.06 $ 0.03 $ (0.23) $ 0.01 $ (0.01) $ (0.30) $ (0.27) $ (0.01) $ 0.00 $ (0.34) $ (0.29) $ (0.68) $ (0.31) $ (0.15) $ (0.32) $ (0.58) $ (1.59)