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Equity and EPS (Detail) $ in Thousands		12 Months Ended
	Sep. 01, 2015 USD ($) shares	Dec. 31, 2016 board_member shares	Feb. 26, 2016	Dec. 31, 2015 shares	Sep. 30, 2015	Dec. 31, 2014 shares	Dec. 31, 2013 shares
Equity [Abstract]
Number of board members that common stockholders are entitled to elect | board_member		4
Total number of board members | board_member		9
Number of board members preferred stock shareholders entitled to elect | board_member		5
Board of directors, term of service		1 year
Minimum single shareholder ownership percentage to call special stockholder meeting (as a percent)		10.00%
Incremental common shares attributable to dilutive effect of equity unit purchase agreements	950,000
Stock repurchase program, authorized amount | $	$ 14,488
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)		0		0		4,000	10,000
ICP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity method ownership percentage (percent)		30.00%	30.00%		30.00%
Affiliated Entity [Member] | ICP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity method ownership percentage (percent)					70.00%
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of nonvested shares (in shares)		0		128,500		278,900	569,296
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of nonvested shares (in shares)		527,486		437,946		413,288	371,502
The 2004 Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of nonvested shares (in shares)		0
The 2004 Plan [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized shares remaining for issuance		331,000

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Common Stock, Number of Board Members Shareholders Entitled To Elect

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Preferred Stock, Number of Board Members Shareholders Entitled To Elect

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The maximum number of shares authorized for issuance under the deferred compensation arrangement as of the balance sheet date.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of equity unit purchase agreements using the treasury stock method.

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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.

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