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Stockholder's Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Oct. 31, 2018 | Mar. 02, 2018 | Dec. 31, 2017
Statement Of Shareholders Equity [Line Items] |  |  |  |  |
Effective portion of unrealized gain on derivative instruments | $ 3,072,000 | $ 3,072,000 |  |  | $ 507,000
Stock repurchase program, authorized |  |  | $ 100,000,000 |  |
Share repurchase, amount |  | $ 42,827,000 |  |  |
2018 Stock Repurchase Plan [Member] |  |  |  |  |
Statement Of Shareholders Equity [Line Items] |  |  |  |  |
Common Stock Repurchase, Shares | 380 | 793 |  |  |
Stock repurchase program, authorized |  |  |  | $ 50,000,000 |
Share repurchase, amount | $ 18,200,000 | $ 42,800,000 |  |  |
Share repurchase, price per share | $ 47.75 | $ 53.96 |  |  |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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