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Subsequent Events - Additional Information (Detail) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 06, 2018 | Jan. 02, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 05, 2018
Subsequent Event [Line Items] |  |  |  |  |  |
Cash dividend |  |  | $ 4.60 | $ 3.60 | $ 2.80 |
Revolving credit agreement maximum borrowing capacity |  |  | $ 600,000,000 |  |  |
Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Revolving credit agreement maximum borrowing capacity |  |  |  |  |  | $ 300,000,000
Common Stock | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Cash dividend |  | $ 1.25 |  |  |  |
Dividends, date declared |  | Jan. 02, 2018 |  |  |  |
Dividends Payable, Date to be Paid |  | Jan. 31, 2018 |  |  |  |
Dividends, date of record |  | Jan. 16, 2018 |  |  |  |
Date new dividend rate will be effective | 2018-04 |  |  |  |  |
Cash dividend | $ 1.45 |  |  |  |  |
Class B Common Stock | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Cash dividend |  | $ 1.25 |  |  |  |
Dividends, date declared |  | Jan. 02, 2018 |  |  |  |
Dividends Payable, Date to be Paid |  | Jan. 31, 2018 |  |  |  |
Dividends, date of record |  | Jan. 16, 2018 |  |  |  |
Date new dividend rate will be effective | 2018-04 |  |  |  |  |
Cash dividend | $ 1.45 |  |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Date the dividend to be paid was declared, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Definition Board Approved Quarterly Cash Dividend Date Effective Month And Year + References No definition available. + Details
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