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Stock-Based Compensation Plans and Employee Benefits - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |
Number of Options Outstanding, Beginning Balance | 588 | 903 | 1,406
Number of Options, Granted | 0 | 77 | 316
Number of Options, Spin-off adjustment | 139 |  |
Number of Options, Exercised | (19) | (26) | (427)
Number of Options, Forfeited | (262) | (366) | (392)
Number of Options Outstanding, Ending Balance | 446 | 588 | 903
Number of Options exercisable | 368 | 398 | 519
Weighted Average Exercise Price, Beginning balance | $ 27.64 | $ 38.32 | $ 40.58
Weighted Average Exercise Price, Granted | 0 | 28.86 | 33.48
Weighted Average Exercise Price, Spin-off adjustment | 0 |  |
Weighted Average Exercise Price, Exercised | 9.73 | 14.66 | 23.24
Weighted Average Exercise Price, Forfeited | 32.26 | 44.62 | 58.92
Weighted Average Exercise Price, Ending balance | 25.71 | 27.64 | 38.32
Weighted Average Exercise Price, Options exercisable | $ 25.86 | $ 34.92 | $ 40.98
Weighted-Average Remaining Contractual Term (Years), Ending Balance | 5 years 2 months 12 days |  |
Weighted-Average Remaining Contractual Term (Years), Options exercisable | 4 years 9 months 18 days | 4 years 6 months | 4 years 6 months
Aggregate Intrinsic Value, Ending balance | $ 27 |  |
Aggregate Intrinsic Value, Options exercisable | $ 27 | $ 196 | $ 1,608

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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