Quarterly report pursuant to Section 13 or 15(d)

Summary of Incentive Compensation Expense (Detail)

v2.4.0.8
Summary of Incentive Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Share-based compensation charged to operating income $ 3,758 $ 2,255
Total charged to operating income 6,841 7,178
General and Administrative Expense
    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Share-based compensation charged to operating income 3,758 [1] 2,255 [1]
Cash-based incentive compensation charged to operating income 1,781 [1] 3,530 [1]
Lease Operating Expense
    
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]    
Cash-based incentive compensation charged to operating income $ 1,302 $ 1,393
[1] Reclassified $0.7 million from cash-based incentive compensation expense to share-based compensation expense in the three months ended March 31, 2014 related to the CEO’s 2013 award.