Deferred compensation arrangement grants in period weighted average grant date fair value.

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- Definition

Dividends payable related to unvested restricted shares.

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- Definition

Percentage of compound annual growth rate in performance period used under condition one of performance goal.

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Percentage of compound annual growth rate in performance period used under condition three of performance goal.

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- Definition

Percentage of compound annual growth rate in performance period used under condition two of performance goal.

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- Definition

Percentage of rate used under condition one of performance goal.

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Percentage of rate used under condition two of performance goal.

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No definition available.

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- Definition

Performance period under performance goal.

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No definition available.

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- Definition

Weighted average price of shares repurchased.

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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- Definition

The amount of plan compensation cost recognized during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Discount rate from fair value on offering date that participants pay for shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Date the equity-based award expires, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Period Type:	instant

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Percentage of vesting of share-based compensation awards.

+ References

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ 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.

+ References

Reference 1: 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=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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.

+ References

Reference 1: 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=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

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Shareholders' Equity - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common stock repurchased	1,949,517	2,380,504	2,377,583
Weighted average prices	$ 23.20	$ 26.92	$ 23.36
Repurchases of common stock	$ 45,219,000	$ 64,094,000	$ 55,541,000
Number of shares authorized to repurchase	624,123
Dividends payable	$ 779,000
Discounted purchase price of market value for Employee Stock Purchase Plan	85.00%
Compensation expense	$ 177,000	$ 247,000	$ 220,000
Number of options to purchase stock	0	0	0
Percentage of compensation expense	100.00%
Aggregate fair value upon grant date	$ 630,000	$ 7,317,000	$ 2,099,000
Performance Period Commencing January 1, 2015 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of rate used under condition one of performance goal	50.00%
Percentage of compound annual growth rate in performance period used under condition one of performance goal	6.00%
Performance period under performance goal	3 years
Percentage of rate used under condition two of performance goal	100.00%
Percentage of compound annual growth rate in performance period used under condition two of performance goal	9.00%
Performance Period Commencing April 1, 2013 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of compensation expense			100.00%
Stock Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock-based awards available for grant under the long-term incentive plan	7,217,496
Period for long-term incentive plan	10 years
Termination date	Oct. 22, 2023
Cliff vesting period	4 years
Stock Compensation Plan [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Period for long-term incentive plan	10 years
Cliff vesting period	5 years
Stock Compensation Plan [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cliff vesting period	3 years
RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, Granted	372,547	374,939	827,562
Compensation expense	$ 0
RSUs [Member] \| Share-based Compensation Award, Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, Granted	230,258	277,405	375,000
RSUs [Member] \| Maximum [Member] \| Performance Period Commencing January 1, 2015 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of compound annual growth rate in performance period used under condition three of performance goal	9.00%
RSUs [Member] \| Minimum [Member] \| Performance Period Commencing January 1, 2015 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of compound annual growth rate in performance period used under condition three of performance goal	6.00%
Open Market Transaction [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common stock repurchased		1,178,607
Weighted average prices		$ 25.76
Repurchases of common stock		$ 30,362,000
Dutch Auction Tender Offer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common stock repurchased		1,201,897
Weighted average prices		$ 28.06
Repurchases of common stock		$ 33,732,000
Repurchases From Recipients Of Stock Based Compensation Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common stock repurchased	138,000	71,000	258,000
Weighted average prices	$ 22.56	$ 25.68	$ 14.79
Repurchases of common stock	$ 3,113,000	$ 1,823,000	$ 3,817,000