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Stock-Based Compensation - Stock Options Outstanding (Detail) - $ / shares shares in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Options Outstanding at 12/31/17 | 5,148 | 6,338
Options Exercisable at 12/31/17 | 4,351 |
Weighted Average Exercise Price, Options exercisable | $ 23.78 |
$14.88 - 18.96 [Member] |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Lower Range Limit | 14.88 |
Upper Range Limit | $ 18.96 |
Options Outstanding at 12/31/17 | 1,623 |
Weighted Avg. Remaining Contractual Life In Years, Options Outstanding | 6 years 7 days |
Weighted Average Exercise Price, Options Outstanding | $ 15.77 |
Options Exercisable at 12/31/17 | 1,063 |
Weighted Average Exercise Price, Options exercisable | $ 15.96 |
$18.97 - 23.45 [Member] |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Lower Range Limit | 18.97 |
Upper Range Limit | $ 23.45 |
Options Outstanding at 12/31/17 | 801 |
Weighted Avg. Remaining Contractual Life In Years, Options Outstanding | 6 years 8 months 4 days |
Weighted Average Exercise Price, Options Outstanding | $ 19.11 |
Options Exercisable at 12/31/17 | 565 |
Weighted Average Exercise Price, Options exercisable | $ 19.17 |
$23.46 - 30.35 [Member] |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Lower Range Limit | 23.46 |
Upper Range Limit | $ 30.35 |
Options Outstanding at 12/31/17 | 1,400 |
Weighted Avg. Remaining Contractual Life In Years, Options Outstanding | 4 years 1 month 28 days |
Weighted Average Exercise Price, Options Outstanding | $ 23.85 |
Options Exercisable at 12/31/17 | 1,399 |
Weighted Average Exercise Price, Options exercisable | $ 23.85 |
$30.36 - 41.92 [Member] |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Lower Range Limit | 30.36 |
Upper Range Limit | $ 41.92 |
Options Outstanding at 12/31/17 | 1,324 |
Weighted Avg. Remaining Contractual Life In Years, Options Outstanding | 3 years 3 months 14 days |
Weighted Average Exercise Price, Options Outstanding | $ 31.94 |
Options Exercisable at 12/31/17 | 1,324 |
Weighted Average Exercise Price, Options exercisable | $ 31.94 |

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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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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