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Schedule of Share-based Compensation Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total share-based compensation expense [1] $ 5,218 $ 7,061 $ 10,138
Income tax benefit [1] 1,353 2,698 4,101
Share-based compensation, net of income taxes [1] 3,865 4,363 6,037
Stock Options | Direct Cost Of Revenues      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total share-based compensation expense [1] 3,736 5,404 6,807
Stock Options | Selling, General and Administrative Expenses      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total share-based compensation expense [1] 1,482 1,783 1,849
Stock Options | Special Charges      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total share-based compensation expense [1],[2]   (126) 1,482
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total share-based compensation expense [3] 14,001 16,469 25,172
Income tax benefit [3] 5,138 6,490 9,094
Share-based compensation, net of income taxes [3] 8,863 9,979 16,078
Restricted Stock | Direct Cost Of Revenues      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total share-based compensation expense [3] 6,532 8,951 9,181
Restricted Stock | Selling, General and Administrative Expenses      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total share-based compensation expense [3] $ 7,469 8,508 10,053
Restricted Stock | Special Charges      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Total share-based compensation expense [2],[3]   $ (990) $ 5,938
[1] Includes options and cash-settled stock appreciation rights.
[2] Special charges of $0.2 million equity award expense acceleration and $0.1 million option expense acceleration are net of forfeitures of $1.2 million and $0.2 million, respectively, for the year ended December 31, 2014. (See “Note 4. Special Charges” to the Consolidated Financial Statements for information related to the special charges).
[3] Includes restricted share awards, performance and market condition restricted stock units, and cash-settled restricted stock units.