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Reconciliation of Changes in Stockholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Class Of Stock [Line Items]            
Beginning Balance $ 3,403,369 $ 3,505,423 $ 3,934,541 $ 3,982,493 $ 3,505,423 $ 3,982,493
Beginning Balance (in shares)   267,315,526     267,315,526  
Net loss (49,447) $ (28,614) (10,713) (34,417) $ (78,061) (45,130)
Foreign currency translation adjustment 848 944 (1,530) (1,984) 1,792 (3,514)
Exercise of stock options 9,219     485 $ 9,219 485
Exercise of stock options (in shares)         700,000  
Stock-based compensation 11,050 9,338 9,907 9,365 $ 20,388 19,272
Payment of cash dividends (8,344) (8,499) (8,832) (4,443) (16,843) (13,275)
Dividend equivalents (126) (110) (83) (30) (236) (113)
Purchase of treasury stock (88,258) (75,113) (42,951) (16,928) (163,371) (59,879)
Ending Balance $ 3,278,311 3,403,369 3,880,339 3,934,541 $ 3,278,311 3,880,339
Ending Balance (in shares) 268,790,705       268,790,705  
Common Stock            
Class Of Stock [Line Items]            
Beginning Balance $ 2,673 $ 2,673 $ 2,663 $ 2,662 $ 2,673 $ 2,662
Beginning Balance (in shares) 267,353,000 267,316,000 266,299,000 266,259,000 267,316,000 266,259,000
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 $ 8          
Vesting of restricted stock units (in shares) 739,000 38,000 10,000      
Forfeitures of restricted stock (in shares) (1,000) (1,000) (2,000)   (2,000) (2,000)
Ending Balance $ 2,688 $ 2,673 $ 2,667 $ 2,663 $ 2,688 $ 2,667
Ending Balance (in shares) 268,791,000 267,353,000 266,688,000 266,299,000 268,791,000 266,688,000
Additional Paid-in Capital            
Class Of Stock [Line Items]            
Beginning Balance $ 2,836,492 $ 2,827,154 $ 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 (8)          
Stock-based compensation 11,050 9,338 9,907 9,365 20,388 19,272
Ending Balance 2,856,746 2,836,492 2,805,575 2,795,672 2,856,746 2,805,575
Retained Earnings            
Class Of Stock [Line Items]            
Beginning Balance 1,716,334 1,753,557 2,067,007 2,105,897 1,753,557 2,105,897
Net loss (49,447) (28,614) (10,713) (34,417) (78,061) (45,130)
Payment of cash dividends (8,344) (8,499) (8,832) (4,443) (16,843) (13,275)
Dividend equivalents (126) (110) (83) (30) (236) (113)
Ending Balance 1,658,417 1,716,334 2,047,379 2,067,007 1,658,417 2,047,379
Accumulated Other Comprehensive Income (Loss)            
Class Of Stock [Line Items]            
Beginning Balance 3,431 2,487 4,838 6,822 2,487 6,822
Foreign currency translation adjustment 848 944 (1,530) (1,984) 1,792 (3,514)
Ending Balance 4,279 3,431 3,308 4,838 4,279 3,308
Treasury Stock            
Class Of Stock [Line Items]            
Beginning Balance (1,155,561) (1,080,448) (935,639) (918,711) (1,080,448) (918,711)
Purchase of treasury stock (88,258) (75,113) (42,951) (16,928) (163,371) (59,879)
Ending Balance $ (1,243,819) $ (1,155,561) $ (978,590) $ (935,639) $ (1,243,819) $ (978,590)