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Shareholders' Equity - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 23, 2017 | Sep. 30, 1999
Stockholders Equity Note [Line Items] |  |  |  |  |
Preferred stock outstanding | 0 | 0 |  |  |
Maximum aggregate offering price under sales agreement |  |  |  | $ 250,000,000 |
Net proceeds from the sale of Common stock | $ 247,744,000 |  |  |  |
Direct stock issuance costs | $ 311,000 |  |  |  |
Number of shares authorized to be repurchased |  |  |  |  | 7,500,000
Treasury stock, shares repurchased | 0 | 0 | 0 |  |
Cost of repurchased shares | $ 87,440,000 | $ 114,425,000 |  |  |
Remaining number of shares authorized to be repurchased | 1,129,087 |  |  |  |
Common Stock |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Sale of common stock, shares | 1,498,662 |  |  |  |
Common Stock |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Amount of votes common stock is entitled | One |  |  |  |
Percentage of Board entitled to elect | 25.00% |  |  |  |
Treasury stock, shares | 4,823,988 | 6,322,650 |  |  |
Class B Common Stock |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Amount of votes common stock is entitled | Ten |  |  |  |
Treasury stock, shares | 48,263 | 48,263 |  |  |

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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding. + 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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