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Quarterly Financial Information - Balance Sheets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current Assets:                    
Cash $ 28,747       $ 32,114       $ 22,275 $ 25,634
Restricted cash 11,818       5,218          
Accounts receivable, net 73,715       70,684          
Deferred tax asset 1,685       1,053          
Prepaid expenses and other assets 18,758       20,078          
Total current assets 134,723       129,147          
Investment in equity investee 12,264       11,756          
Property and equipment, net 34,128       29,535          
Goodwill 368,133       368,837       373,119 372,307
Other intangible assets, net 312,059       334,628          
Other long-term assets 8,795       11,418          
Total assets 870,102       885,321          
Current Liabilities:                    
Accrued liabilities 37,308       26,052          
Accounts payable 21,216       17,753          
Unearned income 2,877       3,296          
Income tax payable 1,350       1,956          
Current portion of long-term debt 22,750       19,000          
Short-term borrowings 17,000       23,000          
Total current liabilities 102,501       91,057          
Long-term debt 625,745       647,579          
Long-term deferred tax liability 20,614       23,072          
Unearned income-long-term 10,939       8,312          
Other long-term liabilities 12,089       20,461          
Total liabilities $ 771,888       $ 790,481          
Commitments and contingencies                
Stockholders' equity                    
Preferred stock, par value $0.01; 2,000,000 shares authorized; none issued                
Common stock, par value $0.01; 206,000,000 shares authorized $ 750       $ 779          
Additional paid-in capital 9,718       59,740          
Accumulated earnings 95,328       40,843          
Accumulated other comprehensive loss, net of tax (7,582)       (6,522)          
Total stockholders' equity 98,214       94,840       87,972 101,593
Total liabilities and stockholders' equity $ 870,102       885,321          
As Previously Reported [Member]                    
Current Assets:                    
Cash   $ 40,401 $ 38,837 $ 32,430 32,114 $ 29,226 $ 27,831 $ 27,242 22,485 25,634
Restricted cash   13,547 6,262 6,924 5,718 6,126 5,195 5,247    
Accounts receivable, net   68,429 71,091 78,745 75,810 68,969 71,479 68,403    
Deferred tax asset   6,921 2,323 2,899 399 3,378 2,812 3,823    
Prepaid expenses and other assets   20,736 21,678 21,659 20,565 21,880 21,846 18,919    
Total current assets   150,034 140,191 142,657 134,606 129,579 129,163 123,634    
Investment in equity investee   12,281 12,251 11,903 11,756 11,492 11,287 10,895    
Property and equipment, net   33,281 31,627 28,080 29,535 29,482 29,371 30,494    
Goodwill   368,543 368,911 369,171 368,837 369,304 369,203 369,101    
Other intangible assets, net   309,680 317,431 323,941 334,584 338,248 347,114 355,801    
Other long-term assets   9,078 9,880 10,227 10,917 12,335 13,745 15,958    
Total assets   882,897 880,291 885,979 890,235 890,440 899,883 905,883    
Current Liabilities:                    
Accrued liabilities   32,917 29,275 27,650 26,052 26,023 29,159 28,057    
Accounts payable   22,417 19,133 19,396 22,879 14,748 14,256 12,107    
Unearned income   11,683 11,734 11,118 9,825 8,866 8,498 7,213    
Income tax payable   62 81 712 1,956 1,945 1,801 1,762    
Current portion of long-term debt   20,875 19,000 19,000 19,000 19,000 19,000 19,000    
Short-term borrowings   18,000 4,000 20,000 23,000 8,000 23,000 40,600    
Deferred tax liability     111 405 1,799 350 461 356    
Total current liabilities   105,954 83,334 98,281 104,511 78,932 96,175 109,095    
Long-term debt   632,137 638,530 643,053 647,579 652,102 656,626 661,153    
Long-term deferred tax liability   23,858 19,255 19,708 15,674 20,308 20,702 20,767    
Other long-term liabilities   2,695 2,856 2,552 2,898 238 251 301    
Total liabilities   $ 764,644 $ 743,975 $ 763,594 $ 770,662 $ 751,580 $ 773,754 $ 791,316    
Commitments and contingencies      
Stockholders' equity                    
Preferred stock, par value $0.01; 2,000,000 shares authorized; none issued      
Common stock, par value $0.01; 206,000,000 shares authorized   $ 762 $ 775 $ 774 $ 779 $ 787 $ 786 $ 784    
Additional paid-in capital   28,502 51,914 50,403 59,740 83,296 82,167 81,332    
Accumulated earnings   95,038 89,347 76,841 65,576 60,924 49,701 39,770    
Accumulated other comprehensive loss, net of tax   (6,049) (5,720) (5,633) (6,522) (6,147) (6,525) (7,319)    
Total stockholders' equity   118,253 136,316 122,385 119,573 138,860 126,129 114,567    
Total liabilities and stockholders' equity   882,897 880,291 885,979 890,235 890,440 899,883 905,883    
Other Insignificant Corrective Adjustments [Member]                    
Current Assets:                    
Deferred tax asset   (5,219) (481) (1,298) 755 (856) 125 (78)    
Prepaid expenses and other assets   (1,020) (478) (326) 259 1,260 84 831    
Total current assets   (6,239) (959) (1,624) 1,014 404 209 753    
Total assets   (6,239) (959) (1,624) 1,014 404 209 753    
Current Liabilities:                    
Deferred tax liability     802 508 (886) (350) (461) (356)    
Total current liabilities     802 508 (886) (350) (461) (356)    
Long-term deferred tax liability   (1,514) 2,765 2,983 7,398 5,151 6,062 6,780    
Other long-term liabilities   8,360 19,591 18,476 17,563 17,279 16,208 15,495    
Total liabilities   $ 6,846 $ 23,158 $ 21,967 $ 24,075 $ 22,080 $ 21,809 $ 21,919    
Commitments and contingencies      
Stockholders' equity                    
Preferred stock, par value $0.01; 2,000,000 shares authorized; none issued      
Accumulated earnings   $ (13,085) $ (24,117) $ (23,591) $ (23,061) $ (21,676) $ (21,600) $ (21,166)    
Total stockholders' equity   (13,085) (24,117) (23,591) (23,061) (21,676) (21,600) (21,166)    
Total liabilities and stockholders' equity   (6,239) (959) (1,624) 1,014 404 209 753    
Other Insignificant Corrective Adjustments [Member]                    
Current Assets:                    
Cash                 (210)  
Restricted cash         (500) (500) (500) (500)    
Accounts receivable, net   (2,416) (2,794) (2,764) (5,126) (2,419) (2,441) (2,030)    
Deferred tax asset   (101) (101) (101) (101)          
Prepaid expenses and other assets   (758) (774) (853) (746) (379) (214) (182)    
Total current assets   (3,275) (3,669) (3,718) (6,473) (3,298) (3,155) (2,712)    
Other intangible assets, net         44 303        
Other long-term assets         501 500 500 500    
Total assets   (3,275) (3,669) (3,718) (5,928) (2,495) (2,655) (2,212)    
Current Liabilities:                    
Accrued liabilities   (282)                
Accounts payable   (2,416) (2,376) (2,764) (5,126) (2,420) (2,903) (2,490)    
Unearned income   (8,799) (8,507) (7,535) (6,529) (6,212) (5,508) (4,309)    
Deferred tax liability     (913) (913) (913)          
Total current liabilities   (11,497) (11,796) (11,212) (12,568) (8,632) (8,411) (6,799)    
Long-term deferred tax liability   (913)                
Unearned income-long-term   10,088 9,960 9,154 8,312 8,160 7,620 6,586    
Total liabilities   $ (2,322) $ (1,836) $ (2,058) $ (4,256) $ (472) $ (791) $ (213)    
Commitments and contingencies      
Stockholders' equity                    
Preferred stock, par value $0.01; 2,000,000 shares authorized; none issued      
Additional paid-in capital           $ 1,421 $ 1,422 $ 1,421    
Accumulated earnings   $ (953) $ (1,833) $ (1,660) $ (1,672) (3,444) (3,286) (3,420)    
Total stockholders' equity   (953) (1,833) (1,660) (1,672) (2,023) (1,864) (1,999)    
Total liabilities and stockholders' equity   (3,275) (3,669) (3,718) (5,928) (2,495) (2,655) (2,212)    
As Restated [Member]                    
Current Assets:                    
Cash   40,401 38,837 32,430 32,114 29,226 27,831 27,242 $ 22,275 $ 25,634
Restricted cash   13,547 6,262 6,924 5,218 5,626 4,695 4,747    
Accounts receivable, net   66,013 68,297 75,981 70,684 66,550 69,038 66,373    
Deferred tax asset   1,601 1,741 1,500 1,053 2,522 2,937 3,745    
Prepaid expenses and other assets   18,958 20,426 20,480 20,078 22,761 21,716 19,568    
Total current assets   140,520 135,563 137,315 129,147 126,685 126,217 121,675    
Investment in equity investee   12,281 12,251 11,903 11,756 11,492 11,287 10,895    
Property and equipment, net   33,281 31,627 28,080 29,535 29,482 29,371 30,494    
Goodwill   368,543 368,911 369,171 368,837 369,304 369,203 369,101    
Other intangible assets, net   309,680 317,431 323,941 334,628 338,551 347,114 355,801    
Other long-term assets   9,078 9,880 10,227 11,418 12,835 14,245 16,458    
Total assets   873,383 875,663 880,637 885,321 888,349 897,437 904,424    
Current Liabilities:                    
Accrued liabilities   32,635 29,275 27,650 26,052 26,023 29,159 28,057    
Accounts payable   20,001 16,757 16,632 17,753 12,328 11,353 9,617    
Unearned income   2,884 3,227 3,583 3,296 2,654 2,990 2,904    
Income tax payable   62 81 712 1,956 1,945 1,801 1,762    
Current portion of long-term debt   20,875 19,000 19,000 19,000 19,000 19,000 19,000    
Short-term borrowings   18,000 4,000 20,000 23,000 8,000 23,000 40,600    
Total current liabilities   94,457 72,340 87,577 91,057 69,950 87,303 101,940    
Long-term debt   632,137 638,530 643,053 647,579 652,102 656,626 661,153    
Long-term deferred tax liability   21,431 22,020 22,691 23,072 25,459 26,764 27,547    
Unearned income-long-term   10,088 9,960 9,154 8,312 8,160 7,620 6,586    
Other long-term liabilities   11,055 22,447 21,028 20,461 17,517 16,459 15,796    
Total liabilities   $ 769,168 $ 765,297 $ 783,503 $ 790,481 $ 773,188 $ 794,772 $ 813,022    
Commitments and contingencies      
Stockholders' equity                    
Preferred stock, par value $0.01; 2,000,000 shares authorized; none issued      
Common stock, par value $0.01; 206,000,000 shares authorized   $ 762 $ 775 $ 774 $ 779 $ 787 $ 786 $ 784    
Additional paid-in capital   28,502 51,914 50,403 59,740 84,717 83,589 82,753    
Accumulated earnings   81,000 63,397 51,590 40,843 35,804 24,815 15,184    
Accumulated other comprehensive loss, net of tax   (6,049) (5,720) (5,633) (6,522) (6,147) (6,525) (7,319)    
Total stockholders' equity   104,215 110,366 97,134 94,840 115,161 102,665 91,402    
Total liabilities and stockholders' equity   $ 873,383 $ 875,663 $ 880,637 $ 885,321 $ 888,349 $ 897,437 $ 904,424