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Preferred Stock, Number of Board Members Shareholders Entitled To Elect

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Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

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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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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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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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Number of options outstanding, including both vested and non-vested options.

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Amount of stock repurchase plan authorized.

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Equity and Earnings (Loss) per Share (Detail) $ / shares in Units, $ in Thousands								12 Months Ended
	Sep. 01, 2015 USD ($) shares	Apr. 21, 2015 USD ($)	Mar. 26, 2015 $ / shares	Apr. 09, 2014 USD ($)	Mar. 17, 2014 $ / shares	Apr. 10, 2013 USD ($)	Mar. 18, 2013 $ / shares	Dec. 31, 2015 USD ($) board_member shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares	Sep. 30, 2015	Mar. 31, 2014	Dec. 31, 2012 shares
Equity [Abstract]
Dividends declared (in dollars per share) \| $ / shares			$ 0.06		$ 0.05		$ 0.05
Dividends \| $		$ 1,087		$ 907		$ 916
Dividends paid \| $		1,061		884		897		$ 1,087	$ 907	$ 916
Dividend equivalents paid \| $		$ 26		$ 23		$ 19
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								0
Stock repurchase program, authorized amount \| $	$ 14,488
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)								0	4,000	10,000			20,000
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)								128,500	278,900	569,296			933,887
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of nonvested shares (in shares)								437,946	413,288	371,502			423,264
The 2004 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of nonvested shares (in shares)								128,500
The 2004 Plan [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of nonvested shares (in shares)								128,500
The 2004 Plan [Member] \| Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized shares remaining for issuance								337,500