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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)

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