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Incentive Plan - Summary of Stock Options Outstanding (Detail) | 12 Months Ended
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Dec. 31, 2018 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Number of Options Outstanding | shares | 2,340,842
Weighted Average Remaining Contractual Life, Options Outstanding | 5 years 11 days
Weighted Average Exercise Price, Options Outstanding | $ 18.25
Number Of Options Exercisable | shares | 1,604,576
Weighted Average Remaining Contractual Life, Options Exercisable | 3 years 9 months 27 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 15.90
Exercise Prices 8.45 to 12.28 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Prices Lower Limit | 8.45
Exercise Prices Higher Limit | $ 12.28
Number of Options Outstanding | shares | 465,666
Weighted Average Remaining Contractual Life, Options Outstanding | 1 year 8 months 29 days
Weighted Average Exercise Price, Options Outstanding | $ 9.82
Number Of Options Exercisable | shares | 465,666
Weighted Average Remaining Contractual Life, Options Exercisable | 1 year 8 months 29 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 9.82
Exercise Prices From 12.40 to 15.34 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Prices Lower Limit | 12.4
Exercise Prices Higher Limit | $ 15.34
Number of Options Outstanding | shares | 561,821
Weighted Average Remaining Contractual Life, Options Outstanding | 3 years 4 months
Weighted Average Exercise Price, Options Outstanding | $ 14.07
Number Of Options Exercisable | shares | 554,321
Weighted Average Remaining Contractual Life, Options Exercisable | 3 years 3 months 16 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 14.09
Exercise Prices From 16.06 to 18.09 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Prices Lower Limit | 16.06
Exercise Prices Higher Limit | $ 18.09
Number of Options Outstanding | shares | 590,073
Weighted Average Remaining Contractual Life, Options Outstanding | 6 years 3 months 15 days
Weighted Average Exercise Price, Options Outstanding | $ 17.43
Number Of Options Exercisable | shares | 271,674
Weighted Average Remaining Contractual Life, Options Exercisable | 5 years 11 months 9 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 17.50
Exercise Prices From 19.05 to 27.45 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Prices Lower Limit | 19.05
Exercise Prices Higher Limit | $ 27.45
Number of Options Outstanding | shares | 394,912
Weighted Average Remaining Contractual Life, Options Outstanding | 6 years 9 months 29 days
Weighted Average Exercise Price, Options Outstanding | $ 26.40
Number Of Options Exercisable | shares | 244,665
Weighted Average Remaining Contractual Life, Options Exercisable | 5 years 5 months 13 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 26.10
Exercise Prices From 29.01 to 33.28 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Prices Lower Limit | 29.01
Exercise Prices Higher Limit | $ 33.28
Number of Options Outstanding | shares | 328,370
Weighted Average Remaining Contractual Life, Options Outstanding | 8 years 1 month 30 days
Weighted Average Exercise Price, Options Outstanding | $ 29.03
Number Of Options Exercisable | shares | 68,250
Weighted Average Remaining Contractual Life, Options Exercisable | 8 years 10 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share) | $ 29.10

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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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(2) -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 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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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