Annual report pursuant to Section 13 and 15(d)

Summary of Incentive Compensation Expense (Detail)

v2.4.0.8
Summary of Incentive Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Share-based compensation charged to operating income $ 11,525 $ 12,398 $ 9,710
Cash-based incentive compensation charged to operating income 12,299 10,345 15,913
Total incentive compensation charged to operating income 23,824 22,743 25,623
Lease Operating Expense
      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Share-based compensation charged to operating income     466
Cash-based incentive compensation charged to operating income 3,482 3,787 3,700
General and Administrative Expense
      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Share-based compensation charged to operating income 11,525 12,398 9,244
Cash-based incentive compensation charged to operating income $ 8,817 $ 6,558 $ 12,213