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Share-Based Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock Options
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total share-based compensation expense $ 10,138 [1] $ 8,432 [1] $ 13,619 [1]
Income tax benefit 4,101 [1] 3,104 [1] 5,014 [1]
Share-based compensation, net of income taxes 6,037 [1] 5,328 [1] 8,605 [1]
Stock Options | Direct Cost Of Revenues
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total share-based compensation expense 6,807 [1] 6,012 [1] 10,436 [1]
Stock Options | Selling, General And Administrative Expense
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total share-based compensation expense 1,849 [1] 1,836 [1] 2,649 [1]
Stock Options | Special Charges
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total share-based compensation expense 1,482 [1],[2] 584 [1],[2] 534 [1],[2]
Restricted Stock
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total share-based compensation expense 25,172 [3],[4] 20,577 [3],[4] 23,733 [3]
Income tax benefit 9,094 [3],[4] 6,870 [3],[4] 8,749 [3]
Share-based compensation, net of income taxes 16,078 [3],[4] 13,707 [3],[4] 14,984 [3]
Restricted Stock | Direct Cost Of Revenues
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total share-based compensation expense 9,181 [3],[4] 10,000 [3],[4] 14,382 [3]
Restricted Stock | Selling, General And Administrative Expense
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total share-based compensation expense 10,053 [3],[4] 10,347 [3],[4] 9,052 [3]
Restricted Stock | Special Charges
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total share-based compensation expense $ 5,938 [2],[3],[4] $ 230 [2],[3],[4] $ 299 [2],[3]
[1] Includes options and cash-settled stock appreciation rights.
[2] Relates to accelerated recognition of compensation cost of share-based awards (See Note 4 to the Consolidated Financial Statements for information related to the special charges).
[3] Includes restricted share awards and deferred restricted share units and performance and market condition restricted share units.
[4] Includes cash-settled restricted stock units.