Stockholders Equity [Line Items]

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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- Definition

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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-Topic 505
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-Section 50
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- Definition

Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Stockholders Equity [Line Items]
Common stock, shares issued	93,060,175		93,060,175		92,637,403
Treasury stock, shares	6,519,773		6,519,773		6,519,773
Dividends payable	$ 124,000		$ 124,000		$ 470,000
Share Repurchase Program, authorized amount	250,000,000		250,000,000
Share Repurchase Program [Member]
Stockholders Equity [Line Items]
Share Repurchase Program, remaining authorized repurchase amount	$ 190,000,000		$ 190,000,000
Stock Repurchase Program, number of shares repurchased	0	0	0	0
Common Stock [Member]
Stockholders Equity [Line Items]
Common stock, shares issued	93,060,175		93,060,175		92,637,403
Number of unvested shares	1,284,595		1,284,595
Restricted Stock Units [Member]
Stockholders Equity [Line Items]
Number of unvested shares	1,913,229		1,913,229