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Stockholder's Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 02, 2018
Statement Of Shareholders Equity [Line Items] |  |  |  |  |  |
Effective portion of unrealized gain on derivative instruments | $ 2,300,000 | $ 475,000 | $ (77,000) | $ 1,635,000 | $ (77,000) |
Share repurchase, amount |  |  |  | $ 24,640,000 |  |
2018 Stock Repurchase Plan [Member] |  |  |  |  |  |
Statement Of Shareholders Equity [Line Items] |  |  |  |  |  |
Common Stock Repurchase, Shares |  |  |  | 413 |  |
Stock repurchase program, authorized |  |  |  |  |  | $ 50,000,000
Share repurchase, amount |  |  |  | $ 24,600,000 |  |
Share repurchase, price per share |  |  |  | $ 59.70 |  |

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- Definition Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109978405&loc=d3e80720-113993 Reference 3: 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 + 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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