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Stockholders' Equity - Summary of Changes in Common Shares Available for Awards under Omnibus Incentive Plan and Predecessor Plans (Detail) - shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Restricted stock shares issued for new awards | (20,587) | (71,893) | (101,062)
Restricted stock shares forfeited | 89,699 | 185,056 |
2005 Contingent Stock Plan [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of shares available, beginning of year | 7,694,739 | 8,775,994 | 5,676,699
Restricted stock shares issued for new awards | (481,834) | (419,844) | (572,089)
Shares withheld for taxes | 696,131 |  | 69,821
Number of shares available, end of year | 6,082,001 | 7,694,739 | 8,775,994
Omnibus Incentive Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Newly registered shares under Omnibus Incentive Plan |  |  | 4,250,000
2012 President and COO Four-year Incentive Compensation [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Restricted stock shares issued for new awards | (325,000) |  |
2013 Three-year PSU Awards [member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Restricted stock shares issued for new awards | (1,074,017) |  |
2012 Three-year PSU Awards [member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Restricted stock shares issued for new awards |  | (442,985) |
2011 Three-year PSU Awards [member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Restricted stock shares issued for new awards |  |  | (145,597)
2002 Directors Stock Plan [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Director shares granted and issued | (18,022) | (20,246) | (21,128)
Director units granted and deferred | (17,447) | (925) | (20,444)
Restricted Stock [Member] | 2005 Contingent Stock Plan [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Restricted stock shares forfeited | 87,886 | 185,056 | 106,220
Restricted Stock Units (RSUs) [Member] | 2005 Contingent Stock Plan [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Restricted stock shares issued for new awards | (428,595) | (300,085) | (431,987)
Restricted stock shares forfeited | 29,774 | 38,100 | 9,800
Restricted Stock SLO Awards [Member] | 2005 Contingent Stock Plan [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Restricted stock shares issued for new awards |  |  | (96,773)
Restricted Stock Units RSU SLO Awards [Member] | 2005 Contingent Stock Plan [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Restricted stock shares issued for new awards | (81,614) | (134,078) | (48,528)
SLO Awards [Member] | 2005 Contingent Stock Plan [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Restricted stock shares forfeited |  | 13,752 |

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options granted and deferred in period. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options granted and issued excluding deferred in period. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options withheld for taxes in period. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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=6415400&loc=d3e5070-113901 + Details
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