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Incentive Plan - Summary of Option Activity (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Number of Shares, Outstanding at beginning of year | 2,489,314 | 2,758,833 | 2,281,931
Number of Shares, Granted | 135,107 | 335,150 | 317,460
Number of Shares, Assumed in acquisition | 491,248 | 0 | 886,968
Number of Shares, Exercised | (765,624) | (567,153) | (375,576)
Number of Shares, Forfeited | (9,203) | (35,099) | (11,625)
Number of Shares, Expired | 0 | (2,417) | (340,325)
Number of Shares, Outstanding at end of year | 2,340,842 | 2,489,314 | 2,758,833
Number of Shares, Options exercisable at end of year | 1,604,576 | 1,608,762 | 1,912,630
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |
Weighted Average Exercise Price, Outstanding at beginning of year (in dollars per share) | $ 16.91 | $ 14.94 | $ 17.62
Weighted Average Exercise Price, Granted (in dollars per share) | 27.39 | 29.01 | 17.27
Weighted Average Exercise Price, Assumed in acquisition | 21.92 | 0.00 | 10.30
Weighted Average Exercise Price, Exercised (in dollars per share) | 17.69 | 14.39 | 13.20
Weighted Average Exercise Price, Forfeited (in dollars per share) | 28.42 | 18.42 | 16.37
Weighted Average Exercise Price, Expired (in dollars per share) | 0.00 | 11.70 | 25.02
Weighted Average Exercise Price, Outstanding at end of year (in dollars per share) | $ 18.25 | $ 16.91 | $ 14.94

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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://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 Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(4) -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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