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Employee Benefit Plans - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 Employer | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Supplemental Employee Retirement Plans, Defined Benefit [Member] Members | Dec. 31, 2012 Stock Option [Member] | Dec. 31, 2011 Stock Option [Member] | Dec. 31, 2013 Non-vested restricted stock [Member] | Dec. 31, 2013 401(k) plan [Member] | Dec. 31, 2012 401(k) plan [Member] | Dec. 31, 2011 401(k) plan [Member] | Dec. 31, 2013 2005 Formula Restricted Stock Plan for Non-Employee Directors [Member] Plans | Jun. 30, 2009 2004 Stock Incentive Plan [Member] Common Class A [Member] | Dec. 31, 2013 2004 Stock Incentive Plan [Member] Common Class A [Member] Executive Officer [Member] | Dec. 31, 2013 2004 Stock Incentive Plan [Member] Common Class A [Member] Stock Option [Member] | Dec. 31, 2013 2004 Stock Incentive Plan [Member] Common Class A [Member] Restricted Stock [Member] | Dec. 31, 2012 2004 Stock Incentive Plan [Member] Common Class A [Member] Restricted Stock [Member] | Mar. 31, 2012 2012 Plan [Member] | Mar. 31, 2012 2012 Formula Plan [Member] | Dec. 31, 2013 2012 Formula Plan [Member] Board of Directors Chairman [Member] | Dec. 31, 2013 2004 Plan and 2012 Plan [Member] Common Class A [Member] Minimum [Member] | Dec. 31, 2013 2004 Plan and 2012 Plan [Member] Common Class A [Member] Maximum [Member] | Dec. 31, 2013 Restricted Stock Units (RSUs) [Member] Non-vested restricted stock [Member] | Dec. 31, 2012 Restricted Stock Units (RSUs) [Member] Non-vested restricted stock [Member] | Dec. 31, 2011 Restricted Stock Units (RSUs) [Member] Non-vested restricted stock [Member] | Dec. 31, 2013 Restricted Stock Units (RSUs) [Member] Non-vested restricted stock [Member] Selling, General and Administrative Expenses [Member] | Dec. 31, 2012 Restricted Stock Units (RSUs) [Member] Non-vested restricted stock [Member] Selling, General and Administrative Expenses [Member] | Dec. 31, 2011 Restricted Stock Units (RSUs) [Member] Non-vested restricted stock [Member] Selling, General and Administrative Expenses [Member] | Dec. 31, 2013 Plans In Red Zone [Member] | Dec. 31, 2013 Plans In Yellow Zone [Member] | Dec. 31, 2013 Plans In Green Zone [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employer contribution |  |  |  |  |  |  |  | $ 7.2 | $ 4.4 | $ 1.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of active stock compensation plans |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional terminated plans with outstanding grants |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  | 2,000,000 | 300,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issuable |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option expiration period |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 3 years |  |  |  | 6 months | 3 years |  |  |  |  |  |  |  |  |
Tax benefits recognized related to the compensation expenses |  | 0.1 | 0.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.7 | 1.9 | 1.2 |  |  |  |  |  |
Compensation expense | 0 |  |  |  | 0.1 | 0.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.2 |  |  | 7.2 | 5.0 | 3.3 |  |  |
Restricted stock shares |  |  |  |  |  |  |  |  |  |  |  |  | 538,000 |  |  |  |  |  | 23,000 |  |  |  |  |  |  |  |  |  |  |
Total compensation cost related to non-vested options not yet recognized |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total compensation cost related to non-vested options expected to be recognized over weighted average period |  |  |  |  |  |  | 1 year 8 months 12 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Members of senior management |  |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of employers to make contribution under multi-employer plan | 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension Protection | 2006 | 2006 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Multi-Employer Benefit AI Pension Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Less than 65 percent | Between 65 and less than 80 percent | At least 80 percent
Number of employee increase / (decrease) under multi employer benefit percentage | 7.10% | 5.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total contributions of multi employer Plan |  | 5.00% | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Multiemployer plans contribution percent increase decrease. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Increase (decrease) in the percentage of the entity's employees covered by the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450673-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450702-114947 + Details
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- Definition Indicate whether the multiemployer plan is less than 65 percent funded, between 65 and less than 80 percent funded, or at least 80 percent funded. The acceptable values are: (1) "less than 65 percent", (2) "between 65 and less than 80 percent", (3) "at least 80 percent", and (4) "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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