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Reconciliation of Changes in Stockholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Class Of Stock [Line Items]                
Beginning Balance $ 3,278,311 $ 3,403,369 $ 3,505,423 $ 3,880,339 $ 3,934,541 $ 3,982,493 $ 3,505,423 $ 3,982,493
Beginning Balance (in shares)     267,315,526       267,315,526  
Net loss (261,719) (49,447) $ (28,614) (75,042) (10,713) (34,417) $ (339,780) (120,172)
Foreign currency translation adjustment 854 848 944 1,520 (1,530) (1,984) 2,646 (1,994)
Exercise of stock options   9,219       485 $ 9,219 485
Exercise of stock options (in shares)             700,000  
Stock-based compensation 9,670 11,050 9,338 9,177 9,907 9,365 $ 30,058 28,449
Payment of cash dividends (7,847) (8,344) (8,499) (8,685) (8,832) (4,443) (24,690) (21,960)
Dividend equivalents (160) (126) (110) (106) (83) (30) (396) (219)
Purchase of treasury stock (76,123) (88,258) (75,113) (51,776) (42,951) (16,928) (239,494) (111,655)
Ending Balance $ 2,942,986 3,278,311 3,403,369 3,755,427 3,880,339 3,934,541 $ 2,942,986 3,755,427
Ending Balance (in shares) 269,223,800           269,223,800  
Common Stock                
Class Of Stock [Line Items]                
Beginning Balance $ 2,688 $ 2,673 $ 2,673 $ 2,667 $ 2,663 $ 2,662 $ 2,673 $ 2,662
Beginning Balance (in shares) 268,791,000 267,353,000 267,316,000 266,688,000 266,299,000 266,259,000 267,316,000 266,259,000
Exercise of stock options   $ 7       $ 1 $ 7 $ 1
Exercise of stock options (in shares)   700,000       40,000 700,000 40,000
Issuance of common stock         $ 4     $ 4
Issuance of common stock (in shares)         381,000     381,000
Vesting of restricted stock units $ 4 $ 8   $ 4        
Vesting of restricted stock units (in shares) 433,000 739,000 38,000 406,000 10,000      
Forfeitures of restricted stock (in shares)   (1,000) (1,000) (4,000) (2,000)   (2,000) (6,000)
Ending Balance $ 2,692 $ 2,688 $ 2,673 $ 2,671 $ 2,667 $ 2,663 $ 2,692 $ 2,671
Ending Balance (in shares) 269,224,000 268,791,000 267,353,000 267,090,000 266,688,000 266,299,000 269,224,000 267,090,000
Additional Paid-in Capital                
Class Of Stock [Line Items]                
Beginning Balance $ 2,856,746 $ 2,836,492 $ 2,827,154 $ 2,805,575 $ 2,795,672 $ 2,785,823 $ 2,827,154 $ 2,785,823
Exercise of stock options   9,212       484 9,212 484
Issuance of common stock         (4)     (4)
Vesting of restricted stock units (4) (8)   (4)        
Stock-based compensation 9,670 11,050 9,338 9,177 9,907 9,365 30,058 28,449
Ending Balance 2,866,412 2,856,746 2,836,492 2,814,748 2,805,575 2,795,672 2,866,412 2,814,748
Retained Earnings                
Class Of Stock [Line Items]                
Beginning Balance 1,658,417 1,716,334 1,753,557 2,047,379 2,067,007 2,105,897 1,753,557 2,105,897
Net loss (261,719) (49,447) (28,614) (75,042) (10,713) (34,417) (339,780) (120,172)
Payment of cash dividends (7,847) (8,344) (8,499) (8,685) (8,832) (4,443) (24,690) (21,960)
Dividend equivalents (160) (126) (110) (106) (83) (30) (396) (219)
Ending Balance 1,388,691 1,658,417 1,716,334 1,963,546 2,047,379 2,067,007 1,388,691 1,963,546
Accumulated Other Comprehensive Income (Loss)                
Class Of Stock [Line Items]                
Beginning Balance 4,279 3,431 2,487 3,308 4,838 6,822 2,487 6,822
Foreign currency translation adjustment 854 848 944 1,520 (1,530) (1,984) 2,646 (1,994)
Ending Balance 5,133 4,279 3,431 4,828 3,308 4,838 5,133 4,828
Treasury Stock                
Class Of Stock [Line Items]                
Beginning Balance (1,243,819) (1,155,561) (1,080,448) (978,590) (935,639) (918,711) (1,080,448) (918,711)
Purchase of treasury stock (76,123) (88,258) (75,113) (51,776) (42,951) (16,928) (239,494) (111,655)
Ending Balance $ (1,319,942) $ (1,243,819) $ (1,155,561) $ (1,030,366) $ (978,590) $ (935,639) $ (1,319,942) $ (1,030,366)