Statement Of Shareholders Equity [Line Items]

No definition available.

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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

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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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