Reconciliation of Net (loss) Income and Weighted-Average Shares of Common Stock Outstanding for Purposes of Calculating Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Numerator:    
Net (loss) income $ (27,326) $ 7,440
Basic EPS Denominator:    
Common shares outstanding beginning of year 45,814 46,084
Weighted shares issued (repurchased) during the period (330) 64
Total weighted average shares outstanding 45,484 46,148
Diluted EPS Denominator:    
Common shares outstanding beginning of year 45,814 46,084
Net weighted shares issued (repurchased) during the period (330) 64
Dilutive effect of stock options and nonvested share awards during the period   689 [1]
Total weighted average shares outstanding 45,484 46,837
(Loss) earnings per share:    
Basic $ (0.60) $ 0.16
Diluted $ (0.60) $ 0.16
[1] Common stock equivalents of approximately 570,000 were excluded from the calculation of diluted earnings per share for the quarter ending March 31, 2015 because their inclusion would reduce the net loss per share.