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Background and Basis of Presentation - Summary of Earnings, Weighted Average Common Shares and Potential Common Shares Outstanding (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Numerator:    
Net income for basic and diluted earnings per share $ 12,580 $ 39,476
Denominator:    
Weighted average shares outstanding - basic 191,642 188,480
Dilutive effect of equity-based awards 3,814 4,657
Weighted average common shares outstanding - diluted 195,456 193,137
Earnings per share:    
Basic $ 0.07 $ 0.21
Diluted $ 0.06 $ 0.20