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Restatement of Previously Issued Consolidated Financial Statements - Impact of Restatement Adjustments and Correcting Classifications Adjustments on Consolidated Statement of Cash Flow (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities                            
Net income (loss)                       $ 85,377 $ 66,157 $ (27,117)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:                            
Depreciation and amortization                       64,974 65,988 70,366
Amortization of debt issue costs and accretion of discount                       3,329 3,094 3,905
Write-off of debt issue costs, premium and discount accounted as loss on extinguishment of debt                           16,555
Provision for doubtful accounts and sundry losses                       2,130 1,360 673
Deferred tax benefit                       (3,090) (3,701) (3,419)
Share-based compensation                       5,204 4,587 6,179
Unrealized (gain) loss on indemnification assets                       (14) 446 383
Loss on disposition of property and equipment and other intangibles                       143 734 538
Earnings of equity method investment                       (147) (1,140) (935)
Dividend received from equity method investment                         326 984
(Increase) decrease in assets:                            
Accounts receivable, net                       (4,482) (5,587) 13,646
Prepaid expenses and other assets                       (132) (381) 447
Other long-term assets                       (70) 3,365 (1,381)
Increase (decrease) in liabilities:                            
Accounts payable and accrued liabilities                       7,596 (697) (19,480)
Income tax payable                       (606) 1,697 (2,700)
Unearned income                       2,207 3,571 3,966
Total adjustments                       77,042 73,662 89,727
Net cash provided by operating activities                       162,419 139,819 62,610
Cash flows from investing activities                            
Net increase in restricted cash                       (6,100) (285) (494)
Additions to software and purchase of customer relationship                       (25,960) (14,707) (16,727)
Property and equipment acquired                       (21,022) (10,898) (11,692)
Proceeds from sales of property and equipment                       14 59 16
Net cash used in investing activities                       (53,068) (25,831) (28,897)
Cash flows from financing activities                            
Proceeds from initial public offering, net of offering costs of $12,567                           112,432
Proceeds from issuance of long-term debt                           700,000
Debt issuance costs                           (12,077)
Net (decrease) increase in short-term borrowings                       (6,000) (27,000) 36,000
Proceeds from new short-term borrowing for purchase of equipment                           1,800
Repayments of borrowing for purchase of equipment                       (1,542) (1,200) (13,596)
Dividends paid                       (30,921) (31,359) (16,390)
Statutory minimum withholding taxes paid on share-based compensation                       (306) (2,001) (16,851)
Tax windfall benefits on share-based compensation                         3,669 1,829
Issuance of common stock                         543 29
Repurchase of common stock                       (54,949) (26,197) (75,000)
Settlement of stock options                         (1,604)  
Repayment and repurchase of long-term debt                       (19,000) (19,000) (755,024)
Repayment of other financing agreement                           (224)
Net cash used in financing activities                       (112,718) (104,149) (37,072)
Net (decrease) increase in cash                       (3,367) 9,839 (3,359)
Cash at beginning of the period     $ 32,114       $ 22,275 $ 32,114 $ 22,275 $ 32,114 $ 22,275 32,114 22,275 25,634
Cash at end of the period       $ 32,114               28,747 32,114 22,275
As Previously Reported [Member]                            
Cash flows from operating activities                            
Net income (loss) $ 13,423 $ 20,267 19,063 12,462 $ 19,091 $ 17,773 18,206 39,330 35,979 52,755 55,070   67,532 (24,621)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:                            
Depreciation and amortization 16,934 16,006 16,828 16,531 16,453 16,390 16,614 32,834 33,004 49,767 49,457   65,988 70,366
Amortization of debt issue costs and accretion of discount                         3,094 3,905
Write-off of debt issue costs, premium and discount accounted as loss on extinguishment of debt                           16,555
Provision for doubtful accounts and sundry losses                         1,360 673
Deferred tax benefit                         (1,713) (5,702)
Share-based compensation                         4,587 6,179
Unrealized (gain) loss on indemnification assets                         446 383
Loss on disposition of property and equipment and other intangibles                         734 538
Earnings of equity method investment 3 (84) (115) (235) (241) (343) (321) (199) (664) (196) (905)   (1,140) (935)
Dividend received from equity method investment                         326 984
(Increase) decrease in assets:                            
Accounts receivable, net                         (6,608) 9,243
Prepaid expenses and other assets                         (1,067) 1,685
Other long-term assets                         3,365 (1,381)
Increase (decrease) in liabilities:                            
Accounts payable and accrued liabilities                         (2,883) (16,734)
Income tax payable                         1,697 (2,700)
Unearned income                         4,230 4,429
Total adjustments                         72,416 87,488
Net cash provided by operating activities                         139,948 62,867
Cash flows from investing activities                            
Net increase in restricted cash                         (285) (494)
Additions to software and purchase of customer relationship                         (15,046) (16,980)
Property and equipment acquired                         (10,898) (11,486)
Proceeds from sales of property and equipment                         59 16
Net cash used in investing activities                         (26,170) (28,944)
Cash flows from financing activities                            
Proceeds from initial public offering, net of offering costs of $12,567                           112,432
Proceeds from issuance of long-term debt                           700,000
Debt issuance costs                           (12,077)
Net (decrease) increase in short-term borrowings                         (27,000) 36,000
Proceeds from new short-term borrowing for purchase of equipment                           1,800
Repayments of borrowing for purchase of equipment                         (1,200) (13,596)
Dividends paid                         (31,359) (16,390)
Statutory minimum withholding taxes paid on share-based compensation                         (2,001) (16,851)
Tax windfall benefits on share-based compensation                         3,669 1,829
Issuance of common stock                         543 29
Repurchase of common stock                         (26,197) (75,000)
Settlement of stock options                         (1,604)  
Repayment and repurchase of long-term debt                         (19,000) (755,024)
Repayment of other financing agreement                           (224)
Net cash used in financing activities                         (104,149) (37,072)
Net (decrease) increase in cash                         9,629 (3,149)
Cash at beginning of the period 38,837 32,430 32,114 29,226 27,831 27,242 22,485 32,114 22,485 32,114 22,485 32,114 22,485 25,634
Cash at end of the period 40,401 38,837 32,430 32,114 29,226 27,831 27,242 38,837 27,831 40,401 29,226   32,114 22,485
Other Insignificant Corrective Adjustments [Member]                            
Cash flows from operating activities                            
Net income (loss) 11,034 (525) (529) (1,387) (77) (433) (239) (1,054) (672) 9,979 (748)   (2,135) (3,425)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:                            
Deferred tax benefit                         (1,176) 2,283
(Increase) decrease in assets:                            
Prepaid expenses and other assets                         83 (26)
Increase (decrease) in liabilities:                            
Accounts payable and accrued liabilities                         3,228 1,168
Total adjustments                         2,135 3,425
Other Insignificant Corrective Adjustments [Member]                            
Cash flows from operating activities                            
Net income (loss) 879 (175) 10 1,775 (159) 133 (989) (165) (858) 714 (1,016)   760 929
Adjustments to reconcile net income (loss) to net cash provided by operating activities:                            
Deferred tax benefit                         (812)  
(Increase) decrease in assets:                            
Accounts receivable, net                         1,021 4,403
Prepaid expenses and other assets                         603 (1,212)
Increase (decrease) in liabilities:                            
Accounts payable and accrued liabilities                         (1,042) (3,914)
Unearned income                         (659) (463)
Total adjustments                         (889) (1,186)
Net cash provided by operating activities                         (129) (257)
Cash flows from investing activities                            
Additions to software and purchase of customer relationship                         339 253
Property and equipment acquired                           (206)
Net cash used in investing activities                         339 47
Cash flows from financing activities                            
Net (decrease) increase in cash                         210 (210)
Cash at beginning of the period             (210)   (210)   (210)   (210)  
Cash at end of the period                           (210)
As Restated [Member]                            
Cash flows from operating activities                            
Net income (loss) 25,336 19,567 18,544 12,850 18,855 17,473 16,978 38,111 34,449 63,448 53,306   66,157 (27,117)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:                            
Depreciation and amortization 16,934 16,006 16,828 16,531 16,453 16,390 16,614 32,834 33,004 49,767 49,457   65,988 70,366
Amortization of debt issue costs and accretion of discount                         3,094 3,905
Write-off of debt issue costs, premium and discount accounted as loss on extinguishment of debt                           16,555
Provision for doubtful accounts and sundry losses                         1,360 673
Deferred tax benefit                         (3,701) (3,419)
Share-based compensation                         4,587 6,179
Unrealized (gain) loss on indemnification assets                         446 383
Loss on disposition of property and equipment and other intangibles                         734 538
Earnings of equity method investment 3 (84) (115) (235) (241) (343) (321) (199) (664) (196) (905)   (1,140) (935)
Dividend received from equity method investment                         326 984
(Increase) decrease in assets:                            
Accounts receivable, net                         (5,587) 13,646
Prepaid expenses and other assets                         (381) 447
Other long-term assets                         3,365 (1,381)
Increase (decrease) in liabilities:                            
Accounts payable and accrued liabilities                         (697) (19,480)
Income tax payable                         1,697 (2,700)
Unearned income                         3,571 3,966
Total adjustments                         73,662 89,727
Net cash provided by operating activities                         139,819 62,610
Cash flows from investing activities                            
Net increase in restricted cash                         (285) (494)
Additions to software and purchase of customer relationship                         (14,707) (16,727)
Property and equipment acquired                         (10,898) (11,692)
Proceeds from sales of property and equipment                         59 16
Net cash used in investing activities                         (25,831) (28,897)
Cash flows from financing activities                            
Proceeds from initial public offering, net of offering costs of $12,567                           112,432
Proceeds from issuance of long-term debt                           700,000
Debt issuance costs                           (12,077)
Net (decrease) increase in short-term borrowings                         (27,000) 36,000
Proceeds from new short-term borrowing for purchase of equipment                           1,800
Repayments of borrowing for purchase of equipment                         (1,200) (13,596)
Dividends paid                         (31,359) (16,390)
Statutory minimum withholding taxes paid on share-based compensation                         (2,001) (16,851)
Tax windfall benefits on share-based compensation                         3,669 1,829
Issuance of common stock                         543 29
Repurchase of common stock                         (26,197) (75,000)
Settlement of stock options                         (1,604)  
Repayment and repurchase of long-term debt                         (19,000) (755,024)
Repayment of other financing agreement                           (224)
Net cash used in financing activities                         (104,149) (37,072)
Net (decrease) increase in cash                         9,839 (3,359)
Cash at beginning of the period 38,837 32,430 32,114 29,226 27,831 27,242 22,275 32,114 22,275 32,114 22,275 $ 32,114 22,275 25,634
Cash at end of the period $ 40,401 $ 38,837 $ 32,430 $ 32,114 $ 29,226 $ 27,831 $ 27,242 $ 38,837 $ 27,831 $ 40,401 $ 29,226   $ 32,114 $ 22,275