Related-Party Transactions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Jun. 30, 2013	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Professional fees				$ 1,000
Minimum percentage of voting right in subsidiary to get advisory fee				50.00%
Establishing terms for professional fees				In June 2010, the Company and Crestview agreed to amend the professional services agreement to allow Crestview the ability to elect to receive a portion of their fee in restricted stock and/or options to purchase shares of the Company’s common stock. If elected, stock options would be issued with a strike price equal to the prevailing market price per share as of the grant date and with an expiration of 4 years.
Shares issued, option exercised				448,657	63,368	118,422
Shares repurchase				1,949,517	2,380,504	2,377,583
Repurchases of common stock				$ 45,219	$ 64,094	$ 55,541
Crestview Company [Member]
Related Party Transaction [Line Items]
Shares issued, option exercised		87,332	54,369
Shares repurchase		87,332	54,369
Shares repurchase, other		649,449	670,631
Average exercise price of shares		$ 12.02	$ 15.85			$ 12.02
Aggregate cost of shares		$ 1,050	$ 862
Price per common shares repurchased		$ 25.75	$ 26.25
Repurchases of common stock		$ 18,974	$ 19,031
Crestview Company [Member] | Third Party [Member]
Related Party Transaction [Line Items]
Common stock issued	32,432
Common stock value	$ 270
Professional Services Agreement [Member]
Related Party Transaction [Line Items]
Expense associated with professional services agreement						$ 905
Employee Stock Option [Member]
Related Party Transaction [Line Items]
Stock options expiration period				4 years
MLV [Member] | Other Receivables [Member]
Related Party Transaction [Line Items]
Employee loans outstanding				$ 3,485	$ 143