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Components of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share [Abstract]                      
Net loss available to common shareholders $ (94,855) $ (297,676) $ (178,490) $ (89,097) $ (81,787) $ (19,509) $ (43,835) $ (15,052) $ (660,118) $ (160,183) $ (65,190)
Weighted average outstanding shares of common stock, basic                 47,071,066 46,981,102 48,658,840
Weighted average common stock and equivalents                 47,071,066 46,981,102 48,658,840
Loss per share, basic $ (2.01) $ (6.32) $ (3.79) $ (1.89) $ (1.74) $ (0.42) $ (0.93) $ (0.32) $ (14.02) [1] $ (3.41) [1] $ (1.34) [1]
Loss per share, diluted $ (2.01) $ (6.32) $ (3.79) $ (1.89) $ (1.74) $ (0.42) $ (0.93) $ (0.32) $ (14.02) [2] $ (3.41) [2] $ (1.34) [2]
Antidilutive options and restricted stock shares                 1,233 489,325 284,635
[1] The company calculates “Loss per share, basic” by dividing “Net loss available to common shareholders” by “Weighted average outstanding share of common stock, basic”.
[2] The company calculates “Loss per share, diluted” by dividing “Net loss available to common shareholders” by “Weighted average common stock and equivalents”.