Spok (SPOK) 10-Q 30 Apr 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 27, 2015
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Entity Registrant Name	Spok Holdings, Inc
Entity Central Index Key	1289945
Current Fiscal Year End Date	-19
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		21,744,235

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$105,637	$107,869
Accounts receivable, net	23,374	24,969
Prepaid expenses and other	5,855	7,250
Inventory	3,222	2,673
Deferred income tax assets, net	1,979	2,194
Total current assets	140,067	144,955
Property and equipment, net	16,265	17,395
Goodwill	133,031	133,031
Other intangible assets, net	18,323	19,698
Deferred income tax assets, net	20,167	21,949
Other assets	1,618	862
TOTAL ASSETS	329,471	337,890
Current liabilities:
Accounts payable and accrued liabilities	9,653	11,688
Accrued compensation and benefits	9,732	14,041
Deferred revenue	24,612	24,034
Total current liabilities	43,997	49,763
Deferred revenue	888	937
Other long-term liabilities	8,334	8,131
TOTAL LIABILITIES	53,219	58,831
Commitments and contingencies
Stockholders' equity:
Preferred stock	0	0
Common stock	2	2
Additional paid-in capital	122,704	126,678
Retained earnings	153,546	152,379
TOTAL STOCKHOLDERS' EQUITY	276,252	279,059
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$329,471	$337,890

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Income (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Wireless revenue	$30,690	$34,351
Software revenue	17,448	15,768
Total revenues	48,138	50,119
Operating expenses:
Cost of revenue	8,813	6,805
Service, rental and maintenance	11,256	11,792
Selling and marketing	7,048	7,246
General and administrative	11,001	12,135
Severance and restructuring	0	20
Depreciation, amortization and accretion	3,747	4,029
Total operating expenses	41,865	42,027
Operating income	6,273	8,092
Interest expense, net	-1	-67
Other income, net	60	16
Income before income tax expense	6,332	8,041
Income tax expense	-2,415	-3,151
Net income	$3,917	$4,890
Basic net income per common share (usd per share)	$0.18	$0.23
Diluted net income per common share (usd per share)	$0.18	$0.22
Basic weighted average common shares outstanding	21,898,792	21,638,198
Diluted weighted average common shares outstanding	22,053,015	22,037,796
Cash dividends declared per common share (usd per share)	$0.13	$0.13

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$3,917	$4,890
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	3,747	4,029
Amortization of deferred financing costs	0	65
Deferred income tax expense	1,997	2,594
Amortization of stock based compensation	443	1,086
Provision for doubtful accounts, service credits and other	327	340
Adjustment of non-cash transaction taxes	-49	-115
(Gain) Loss on disposals of property and equipment	-18	-2
Changes in assets and liabilities:
Accounts receivable	1,268	-2,586
Prepaid expenses and other assets	54	807
Accounts payable and accrued liabilities	-9,616	-3,675
Deferred revenue and customer deposits	530	378
Net cash provided by operating activities	2,600	7,811
Cash flows from investing activities:
Purchase of property and equipment	-1,040	-2,643
Proceeds from disposals of property and equipment	30	58
Net cash used in investing activities	-1,010	-2,585
Cash flows from financing activities:
Cash dividends to stockholders	-3,356	-2,707
Purchase of common stock	-466	0
Net cash used in financing activities	-3,822	-2,707
Net (decrease) increase in cash and cash equivalents	-2,232	2,519
Cash and cash equivalents, beginning of period	107,869	89,075
Cash and cash equivalents, end of period	105,637	91,594
Supplemental disclosure:
Income taxes paid	$337	$161

Business

Business	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business	Business — Spōk Holdings, Inc. and its subsidiaries (collectively, “SPŌK” or the “Company”), through its wholly-owned subsidiary, Spōk, Inc., is a provider of paging services and selected software solutions in the United States and abroad, generally in Europe, Canada, Australia, Asia and the Middle East. We deliver smart, reliable critical communications solutions to help protect the health, well-being and safety of people around the globe.

Preparation_of_Interim_Financi

Preparation of Interim Financial Statements	3 Months Ended
	Mar. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Preparation of Interim Financial Statements	Preparation of Interim Financial Statements — Our condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and the rules and regulations of the United States Securities and Exchange Commission (the “SEC”). Amounts shown on the condensed consolidated statements of income within the operating expense categories of cost of revenue; service, rental and maintenance; selling and marketing; and general and administrative are recorded exclusive of severance and restructuring costs, and depreciation, amortization and accretion. These items are shown separately on the condensed consolidated statements of income within operating expenses. Foreign currency translation adjustments were deemed immaterial and consequently, no statements of comprehensive income are presented.
	The financial information included herein, other than the condensed consolidated balance sheet as of December 31, 2014, is unaudited. The condensed consolidated balance sheet at December 31, 2014 has been derived from, but does not include all the disclosures contained in the audited consolidated financial statements as of and for the year ended December 31, 2014. In management’s opinion, our unaudited condensed consolidated statements include all adjustments and accruals that are necessary for a fair presentation of the results of all interim periods reported herein.
	These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and accompanying notes included in the Company's Annual Report on Form 10-K for the year ended December 31, 2014 (the “2014 Annual Report”). The condensed consolidated statements of income for the interim periods presented are not necessarily indicative of the results that may be expected for a full year.
	The accompanying condensed consolidated financial statements include our accounts and the accounts of our wholly owned direct and indirect subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation.
	The preparation of these condensed consolidated financial statements requires management to make judgments and estimates that affect the amounts reported in our condensed consolidated financial statements and accompanying notes. Actual results may differ from these estimates under different assumptions or conditions.

Risks_and_Other_Important_Fact

Risks and Other Important Factors	3 Months Ended
	Mar. 31, 2015
Risks and Uncertainties [Abstract]
Risks and Other Important Factors	Risks and Other Important Factors — See “Item 1A. Risk Factors” of Part II of this Quarterly Report on Form 10-Q (“Quarterly Report”) and "Item 1A. Risk Factors" of Part I of the 2014 Annual Report, which describes key risks associated with our operations and industry.

Recent_and_New_Accounting_Pron

Recent and New Accounting Pronouncements	3 Months Ended
	Mar. 31, 2015
Accounting Changes and Error Corrections [Abstract]
Recent and New Accounting Pronouncements	Recent and New Accounting Pronouncements — In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers. ASU 2014-09 creates a five-step model that requires companies to exercise judgment when considering all relevant facts and circumstances in the determination of when and how revenue is recognized. When ASU 2014-09 was issued, it was effective for annual reporting periods beginning after December 15, 2016, for publicly traded companies and any interim periods that fall within that reporting period. Early application was not permitted. On April 1, 2015, the FASB proposed a one-year delay of the effective date for this new standard. If the proposal is finalized, the standard would be effective in 2018 for calendar year-end public entities. The proposal is expected to include an option for public and private companies to early adopt. Early adoption may be allowed in 2017 for calendar year-end public companies. Once issued, the proposal is expected to have a 30-day comment period. ASU 2014-09 was effective on January 1, 2017 for SPŌK. If the proposal is approved as communicated, the effective date of the standard would move to January 1, 2018. The two permitted transition methods under the new standard are the full retrospective method, in which case the standard would be applied to each prior reporting period presented, or the modified retrospective method, in which case the cumulative effect of applying the standard would be recognized at the date of initial application. We have not selected a transition method. We are also evaluating the potential impact from this ASU on our consolidated financial statements.

Prepaid_Expenses_and_Other

Prepaid Expenses and Other	3 Months Ended
	Mar. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid Expenses and Other	Prepaid Expenses and Other — Prepaid expenses and other consisted of the following:
		March 31,		December 31,
		2015		2014
		(Dollars in thousands)
	Other receivables	$	2	$	751
	Tax receivables	104		155
	Deposits	641		420
	Prepaid insurance	285		517
	Prepaid rent	119		234
	Prepaid repairs and maintenance	842		917
	Prepaid taxes	503		279
	Prepaid commissions	2,557		2,935
	Prepaid expenses	802		1,042
	Total prepaid expenses and other	$	5,855	$	7,250
	Deposits increased by $0.2 million during the three months ended March 31, 2015 primarily due to an increase in a deposit to a single vendor. Other receivables decreased by $0.8 million during the three months ended March 31, 2015 as a deposit was reclassified as a long term receivable from short term receivable. Prepaid insurance, prepaid rent and prepaid repairs and maintenance decreased by $0.2 million, $0.1 million and $0.1 million respectively, as the balances have been recognized as expense over time.

Inventory

Inventory	3 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Inventory	Inventory — Inventory of $3.2 million and $2.7 million at March 31, 2015 and December 31, 2014, respectively, consisted of third-party hardware and software held for resale. We value our inventory based on the lower of cost or current market value. Inventory increased by $0.5 million during the three months ended March 31, 2015 due primarily to the increase in the purchase of third party hardware associated with sales orders and the volume of orders processed.

Depreciation_Amortization_and_

Depreciation, Amortization and Accretion	3 Months Ended
	Mar. 31, 2015
Depreciation, Amortization And Accretion [Abstract]
Depreciation, Amortization and Accretion	Depreciation, Amortization and Accretion — The total depreciation, amortization and accretion expenses related primarily to property and equipment, amortizable intangible assets, and asset retirement obligations for the three months ended March 31, 2015 and 2014 were $3.7 million and $4.0 million, respectively. The consolidated balances consisted of the following for the periods stated:
		For the Three Months Ended March 31,
		2015		2014
		(Dollars in thousands)
	Depreciation	$	2,207	$	2,626
	Amortization	1,375		1,216
	Accretion	165		187
	Total depreciation, amortization and accretion	$	3,747	$	4,029

Goodwill_and_Amortizable_Intan

Goodwill and Amortizable Intangible Assets	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Amortizable Intangible Assets	Goodwill and Amortizable Intangible Assets — Goodwill at March 31, 2015 and December 31, 2014 was $133.0 million. Goodwill is evaluated in the fourth quarter of each year and when events or circumstances suggest a potential impairment has occurred. There were no indicators of impairment as of March 31, 2015.
	Amortizable intangible assets at March 31, 2015 primarily include customer related intangibles, technology based intangibles, contract based intangibles and marketing intangibles that resulted from our acquisition of Amcom Software, Inc. in 2011 and IMCO Technologies Corporation in 2012. Such intangibles are being amortized over periods ranging from two to ten years.
	The gross carrying amount of amortizable intangible assets was $41.6 million at March 31, 2015 and the accumulated amortization was $23.3 million. The net consolidated balance of amortizable intangible assets consisted of the following:
				March 31, 2015
			Useful Life	Gross Carrying		Accumulated			Net Balance
			(In Years)	Amount		Amortization
				(Dollars in thousands)
	Customer relationships		10	$	25,002	$	(10,209	)	$	14,793
	Acquired technology		2 - 4	8,453		(8,082		)	371
	Non-compete agreements		5	2,370		(2,270		)	100
	Trademarks		3	5,754		(2,695		)	3,059
	Total amortizable intangible assets			$	41,579	$	(23,256	)	$	18,323
	Estimated amortization of intangible assets for future periods was as follows:
		(Dollars  in thousands)
	For the remaining nine months ending December 31, 2015	$	3,360
	For the year ending December 31:
	2016	4,160
	2017	2,886
	2018	2,500
	2019	2,500
	Thereafter	2,917
	Total amortizable intangible assets	$	18,323

Other_Assets

Other Assets	3 Months Ended
	Mar. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Assets	Other Assets — Other assets were as follows:
		March 31,		December 31,
		2015		2014
		(Dollars in thousands)
	Deposits	$	936	$	189
	Prepaid royalty	242		242
	Other assets	440		431
	Total other assets	$	1,618	$	862

Accounts_Payable_and_Accrued_L

Accounts Payable and Accrued Liabilities	3 Months Ended
	Mar. 31, 2015
Payables and Accruals [Abstract]
Accounts Payable and Accrued Liabilities	Accounts Payable and Accrued Liabilities — Accounts payable and accrued liabilities were as follows:
		March 31,		December 31,
		2015		2014
		(Dollars in thousands)
	Accounts payable	$	1,215	$	2,784
	Accrued network costs	1,059		1,072
	Accrued taxes	4,533		4,195
	Asset retirement obligations	376		342
	Accrued outside services	1,016		1,101
	Accrued accounting and legal	253		275
	Accrued recognition awards	321		345
	Accrued other	709		696
	Deferred rent	77		77
	Escheat liability	38		—
	Lease incentive	40		147
	Dividends payable - 2011 Long-Term Incentive Plan ("LTIP")	—		637
	Capital lease payable	16		17
	Total accounts payable and accrued liabilities	$	9,653	$	11,688
	Accrued taxes are based on our estimate of outstanding state and local taxes. This balance may be adjusted in the future as we settle with various taxing jurisdictions. The issuance of our common stock associated with the vesting of restricted stock units (“RSUs”) awarded under the 2011 LTIP were made during the first quarter of 2015 (the line item Dividends payable - 2011 LTIP). The issuance of our common stock associated with the vesting of RSUs awarded under the 2015 LTIP is expected to be made during the first quarter of 2018. Therefore, the related dividends payable (the line item Dividends payable - 2015 LTIP) is classified as a long-term liability.

Asset_Retirement_Obligations

Asset Retirement Obligations	3 Months Ended
	Mar. 31, 2015
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	Asset Retirement Obligations — We recognize liabilities and corresponding assets for future obligations associated with the retirement of assets. We have paging equipment assets, principally transmitters, which are located on leased locations. The underlying leases generally require the removal of equipment at the end of the lease term; therefore, a future obligation exists.
	At January 1, 2015, we had recognized cumulative asset retirement costs of $2.8 million. We recorded nominal charges and as a result, the total cumulative asset retirement cost remains $2.8 million at March 31, 2015. The asset retirement cost additions during the three months ended March 31, 2015 increased paging equipment assets and are being depreciated over the related estimated lives of 51 to 57 months. The asset retirement costs and the corresponding liabilities that have been recorded to date generally relate to either current plans to consolidate networks or to the removal of assets at an estimated future terminal date.
	The components of the changes in the asset retirement obligation liabilities were:
		Short-Term			Long-Term			Total
		Portion			Portion
		(Dollars in thousands)
	Balance at January 1, 2015	$	342		$	6,805		$	7,147
	Accretion	31			134			165
	Additions	—			16			16
	Reclassifications	45			(45		)	—
	Amounts paid	(42		)	—			(42		)
	Balance at March 31, 2015	$	376		$	6,910		$	7,286
	The balances above were included with accounts payable and accrued liabilities and other long-term liabilities, respectively, at March 31, 2015.

Deferred_Revenue

Deferred Revenue	3 Months Ended
	Mar. 31, 2015
Revenue Recognition [Abstract]
Deferred Revenue	Deferred Revenue — Deferred revenue at March 31, 2015 was $24.6 million for the current portion and $0.9 million for the non-current portion. Deferred revenue at December 31, 2014 was $24.0 million for the current portion and $0.9 million for the non-current portion. Deferred revenue primarily consists of unearned maintenance, software license and professional services revenue. Unearned maintenance revenue represents a contractual liability to provide maintenance support over a defined period of time for which payment has generally been received. Unearned software license and professional services revenue represents a contractual liability to provide professional services more substantive than post contract support for which not all payments have been received. We will recognize revenue when the service or software is provided or the delivery otherwise meets our revenue recognition criteria.

LongTerm_Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt — On December 15, 2014, we terminated our Amended Credit Agreement and the related revolving credit facility. We did not incur any early termination penalties. The termination of the credit facility had no material effect on our business, financial condition and statement of income. As of March 31, 2015, we had no outstanding debt.

Other_LongTerm_Liabilities

Other Long-Term Liabilities	3 Months Ended
	Mar. 31, 2015
Other Liabilities Disclosure [Abstract]
Other Long-Term Liabilities	Other Long-Term Liabilities — Other long-term liabilities consisted of the following:
		31-Mar-15		31-Dec-14
		(Dollars in thousands)
	Asset retirement obligations	$	6,910	$	6,805
	Dividends payable — 2015 LTIP	32		—
	Escheat liability	145		220
	Capital lease payable	3		6
	Lease incentive	587		426
	Deferred rent	387		404
	Royalty payable	270		270
	Total other long-term liabilities	$	8,334	$	8,131
	The issuance of our common stock associated with the vesting of RSUs awarded under the 2015 LTIP is expected to be made during the first quarter of 2018 should the pre-established performance criteria be achieved. Therefore, the related dividends payable (the line item Dividends payable - 2015 LTIP) is classified as a long-term liability. The increase in lease incentives of $0.2 million relates to the extension of two corporate leases.

Stockholders_Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity — Our authorized capital stock consists of 75 million shares of common stock, par value $0.0001 per share, and 25 million shares of preferred stock, par value $0.0001 per share.
	Changes in Stockholders’ Equity. Changes in stockholders’ equity for the three months ended March 31, 2015 consisted of:
		(Dollars in thousands)
	Balance at January 1, 2015	$	279,059
	Net income for the three months ended March 31, 2015	3,917
	Cash dividends declared	(2,749		)
	Amortization of stock based compensation	443
	Stock repurchase - 2011 LTIP	(3,825		)
	Stock repurchase - other	(466		)
	Other	(127		)
	Balance at March 31, 2015	$	276,252
	General. At March 31, 2015 and December 31, 2014, there were 21,739,412 and 21,978,762 shares of common stock outstanding, respectively, and no shares of preferred stock outstanding.
	The following table summarizes the activities under the 2012 Equity Incentive Award Plan (the "2012 Equity Plan") from inception through March 31, 2015:
		Activity
	Total equity securities available at May 16, 2012	2,194,986
	Add: 2011 LTIP RSUs forfeited by eligible employees	209,382
	Add: Restricted shares of common stock ("restricted stock") forfeited by non-executive member of the Board of Directors	3,189
	Less: 2011 LTIP RSUs awarded to eligible employees	(557,484	)
	Less: Common stock awarded to eligible employees	(5,820	)
	Less: Restricted stock awarded to non-executive members of the Board of Directors	(60,290	)
	Less: Short-Term Incentive Plan (“STIP”) common stock awarded to an eligible employee	(41,702	)
	Less: 2015 LTIP RSUs awarded to eligible employees	(254,777	)
	Total equity securities available at March 31, 2015	1,487,484
	2015 LTIP On December 9, 2014, our Board of Directors adopted a long-term incentive program (over a 36 month vesting period) that included a stock component in the form of RSUs. The 2015 LTIP provides eligible employees the opportunity to earn RSUs based upon the achievement of performance goals established by our Board of Directors for our consolidated revenue and operating cash flows (as defined by the Company) during the period January 1, 2015 through December 31, 2017 (“the performance period”), and continued employment with the Company. Our Board of Directors also approved that future cash dividends related to the RSUs will be set aside and paid in cash to each eligible employee when the RSUs are converted into shares of common stock. Existing RSUs would be converted into shares of common stock on the earlier of a change in control of the Company (as defined in the 2012 Equity Plan) or on or after the third business day following the day that we file our 2017 Annual report on Form 10-K ("2017 Annual Report”) with the SEC but in no event later than December 31, 2018. Any unvested RSUs awarded under the 2015 LTIP and the related cash dividends are forfeited if the participant terminates employment with the Company.
	On January 2, 2015, our Board of Directors granted 254,777 RSUs to eligible employees under the 2012 Equity plan for the 2015 LTIP pursuant to a Restricted Stock Unit Agreement with a grant date fair value of $4.4 million (net of estimated forfeitures). As of March 31, 2015 there were 254,777 RSUs outstanding relating to the 2015 LTIP.
	A total of $0.4 million was included in stock based compensation expense for the three months ended March 31, 2015 relating to the 2015 LTIP.
	The following table details activities with respect to RSUs issued and outstanding under the 2015 LTIP for the three months ended March 31, 2015:
			Shares			Weighted-				Total Unrecognized Compensation Cost (net of estimated forfeitures)			Weighted-Average
						Average Grant				(In thousands)			Period Over Which
						Date Fair Value							Cost is  Expected to
													be Recognized
													(In months)
	Non-vested RSUs at January 1, 2015		—			$	—
	Granted		254,777			17.36
	Vested		—			—
	Forfeited		—			—
	Non-vested RSUs at March 31, 2015		254,777			$	17.36			$	4,073		33
	The following table reflects the stock based compensation expense for the awards under the 2015 LTIP and predecessor 2011 LTIP:
			For the Three Months Ended March 31,
	Equity Awards		2015				2014
			(Dollars in thousands)
	2011 LTIP		$	—			$	1,014
	2015 LTIP		350				—
	Board of Directors Compensation		93				72
	Total stock based compensation		$	443			$	1,086
	The $0.4 million in stock based compensation expense for the 2015 LTIP relates to the 254,777 shares granted on January 2, 2015 to eligible employees. The 2011 LTIP vested on December 31, 2014 and was subsequently paid to eligible employees and therefore, we did not incur any additional expense in 2015 related to this plan. The increase in the Board of Directors compensation reflects the quarterly issuance of restricted shares of common stock ("restricted stock") to each director as part of their annual compensation for service on the Board of Directors.
	Cash Dividends to Stockholders. The following table details our cash dividend payments made in 2015. Cash dividends paid as disclosed in the statements of cash flows for the three months ended March 31, 2015 and 2014 included previously declared cash dividends on shares of vested restricted stock issued to our non-executive directors. Cash dividends on RSUs and restricted stock have been accrued and are paid when the applicable vesting conditions are met. Accrued cash dividends on forfeited restricted stock and RSUs are also forfeited.
	Declaration Date		Record Date		Payment Date		Per Share Amount				Total  Payment(1)
											(Dollars in thousands)
	March 4		March 18		March 30		$	0.125			$	2,715
			Total				$	0.125			$	2,715
	(1)	The total payment reflects the cash dividends paid in relation to common stock and vested restricted stock.
	Future Cash Dividends to Stockholders. On April 29, 2015, our Board of Directors declared a regular quarterly cash dividend of $0.125 per share of common stock, with a record date of May 22, 2015, and a payment date of June 25, 2015. This cash dividend of approximately $2.7 million will be paid from available cash on hand.
	Common Stock Repurchase Program. On October 29, 2014, the Board of Directors extended the common stock repurchase program through December 31, 2015. In extending the common stock repurchase plan, the Board of Directors also maintained the repurchase authority of $15.0 million as of January 1, 2015. During the three months ended March 31, 2015, we purchased 27,467 shares of common stock for $0.5 million.
	The following table presents information with respect to purchases made by the Company during the three months ended March 31, 2015:
	Period	Total Number of Shares Purchased		Average Price Paid Per Share			Total Number of Shares Purchased as Part of the Publicly Announced Plans or Programs		Approximate Dollar Value of Shares That May Yet Be Purchased Under the Publicly Announced Plans or Programs
									(Dollars in thousands)
	Beginning Balance								$	15,000
	January 1 through January 31, 2015	16,031		$	16.92		16,031		14,729
	February 1 through February 28, 2015	1,234		16.98			1,234		14,708
	March 1 through March 31, 2015	230,532		17.34			10,202		14,536
	Total	247,797		$	17.31		27,467
	Other. For 2015, the Board of Directors intends to return a total of $26.0 million to stockholders in the form of dividends and/ or common stock repurchases.
	Additional Paid-in Capital. For the three months ended March 31, 2015, additional paid-in capital decreased by $4.0 million to $122.7 million at March 31, 2015 from $126.7 million at December 31, 2014. The decrease in the three months ended March 31, 2015 was due primarily to the repurchase of shares of common stock for income tax withholding resulting from the issuance of common stock under the 2011 LTIP.
Net Income per Common Share. Basic net income per common share is computed on the basis of the weighted average common shares outstanding. Diluted net income per common share is computed on the basis of the weighted average common shares outstanding plus the effect of all potentially dilutive common shares including outstanding restricted stock and RSUs, which are treated as contingently issuable shares, using the “treasury stock” method. The components of basic and diluted net income per common share were as follows for the periods stated:
		For the Three Months Ended March 31,
		2015				2014
		(Dollars in thousands, except share and per share amounts)
Net income		$	3,917			$	4,890
Weighted average shares of common stock outstanding		21,898,792				21,638,198
Dilutive effect of restricted stock and RSUs		154,223				399,598
Weighted average shares of common stock and common stock equivalents		22,053,015				22,037,796
Net income per common share
Basic		$	0.18			$	0.23
Diluted		$	0.18			$	0.22

Stock_Based_Compensation

Stock Based Compensation	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Based Compensation	Stock Based Compensation — Compensation expense associated with RSUs and restricted stock was recognized based on the fair value of the instruments, over the instruments’ vesting period. The following table reflects the statements of income line items for stock based compensation expense for the periods stated:
		For the Three Months Ended March 31,
	Operating Expense Category	2015		2014
		(Dollars in thousands)
	Cost of revenue	$	34	$	81
	Service, rental and maintenance	29		39
	Selling and marketing	51		131
	General and administrative	329		835
	Total stock based compensation	$	443	$	1,086
	The decrease in stock based compensation expense during the three months ended March 31, 2015, compared to the same period in 2014, was due to the 2015 LTIP as compared to the 2011 LTIP, which fully vested on December 31, 2014. Fewer RSUs were granted under the 2015 LTIP resulting in lower stock based compensation expense in 2015.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes — We file a consolidated U.S. Federal income tax return and income tax returns in state, local and foreign jurisdictions (Canada and Australia) as required.
	At March 31, 2015, we had total deferred income tax assets of $136.4 million and a valuation allowance of $114.1 million resulting in an estimated recoverable amount of deferred income tax assets of $22.2 million. This reflected a change from the December 31, 2014 balance of deferred income tax assets of $138.3 million and a valuation allowance of $114.2 million resulting in an estimated recoverable amount of $24.1 million. The change reflects the expected usage of the deferred income tax assets based on estimated 2015 taxable income.
	We consider both positive and negative evidence when evaluating the recoverability of our deferred income tax assets. The assessment is required to determine whether based on all available evidence, it is more likely than not (i.e., greater than a 50% probability) whether all or some portion of the deferred income tax assets will be realized in the future. During the fourth quarter of each year, we prepare a multi-year forecast of taxable income for our operations. The forecasts of taxable income are not sufficient to result in the full realization of our deferred income tax assets due to the continuing decline in our revenue and taxable income as customers switch to other communication solutions and delay purchasing and implementation decisions.
	The anticipated effective income tax rate is expected to continue to differ from the Federal statutory rate of 35% primarily due to the effect of state income taxes, the effect of changes to the deferred income tax asset valuation allowance, permanent differences between book and taxable income and certain discrete items.
	As of March 31, 2015, we had approximately $308.6 million of Federal net operating losses (“NOLs”) available to offset future taxable income. Section 382 of the Internal Revenue Code limited NOLs, as of January 1, 2015, were $44.3 million which may be used at a rate of $6.1 million per year, and is included in the total Federal NOLs.

Related_Party_Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2015
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions — A member of our Board of Directors also serves as a director for an entity that leases transmission tower sites to the Company. During the fourth quarter of 2013, this entity acquired another one of our vendors, Global Tower Partners. For the three months ended March 31, 2015 and 2014, we incurred site rent expenses of $1.0 million and $1.0 million, respectively, from the entity on which the individual serves as a director. Site rent expenses are included in service, rental and maintenance expenses.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies — There have been no material changes during the three months ended March 31, 2015 to the commitments and contingencies previously reported in the 2014 Annual Report.

Prepaid_Expenses_and_Other_Tab

Prepaid Expenses and Other (Tables)	3 Months Ended
	Mar. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid Expenses and Other	Prepaid expenses and other consisted of the following:
		March 31,		December 31,
		2015		2014
		(Dollars in thousands)
	Other receivables	$	2	$	751
	Tax receivables	104		155
	Deposits	641		420
	Prepaid insurance	285		517
	Prepaid rent	119		234
	Prepaid repairs and maintenance	842		917
	Prepaid taxes	503		279
	Prepaid commissions	2,557		2,935
	Prepaid expenses	802		1,042
	Total prepaid expenses and other	$	5,855	$	7,250

Depreciation_Amortization_and_1

Depreciation, Amortization and Accretion (Tables)	3 Months Ended
	Mar. 31, 2015
Depreciation, Amortization And Accretion [Abstract]
Summary of Depreciation, Amortization and Accretion	The consolidated balances consisted of the following for the periods stated:
		For the Three Months Ended March 31,
		2015		2014
		(Dollars in thousands)
	Depreciation	$	2,207	$	2,626
	Amortization	1,375		1,216
	Accretion	165		187
	Total depreciation, amortization and accretion	$	3,747	$	4,029

Goodwill_and_Amortizable_Intan1

Goodwill and Amortizable Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Net Consolidated Balance of Amortizable Intangible Assets	The net consolidated balance of amortizable intangible assets consisted of the following:
				March 31, 2015
			Useful Life	Gross Carrying		Accumulated			Net Balance
			(In Years)	Amount		Amortization
				(Dollars in thousands)
	Customer relationships		10	$	25,002	$	(10,209	)	$	14,793
	Acquired technology		2 - 4	8,453		(8,082		)	371
	Non-compete agreements		5	2,370		(2,270		)	100
	Trademarks		3	5,754		(2,695		)	3,059
	Total amortizable intangible assets			$	41,579	$	(23,256	)	$	18,323
Estimated Amortization of Intangible Assets	Estimated amortization of intangible assets for future periods was as follows:
		(Dollars  in thousands)
	For the remaining nine months ending December 31, 2015	$	3,360
	For the year ending December 31:
	2016	4,160
	2017	2,886
	2018	2,500
	2019	2,500
	Thereafter	2,917
	Total amortizable intangible assets	$	18,323

Other_Assets_Tables

Other Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Other Assets	Other assets were as follows:
		March 31,		December 31,
		2015		2014
		(Dollars in thousands)
	Deposits	$	936	$	189
	Prepaid royalty	242		242
	Other assets	440		431
	Total other assets	$	1,618	$	862

Accounts_Payable_and_Accrued_L1

Accounts Payable and Accrued Liabilities (Tables)	3 Months Ended
	Mar. 31, 2015
Payables and Accruals [Abstract]
Components of Accounts Payable and Accrued Liabilities	Accounts payable and accrued liabilities were as follows:
		March 31,		December 31,
		2015		2014
		(Dollars in thousands)
	Accounts payable	$	1,215	$	2,784
	Accrued network costs	1,059		1,072
	Accrued taxes	4,533		4,195
	Asset retirement obligations	376		342
	Accrued outside services	1,016		1,101
	Accrued accounting and legal	253		275
	Accrued recognition awards	321		345
	Accrued other	709		696
	Deferred rent	77		77
	Escheat liability	38		—
	Lease incentive	40		147
	Dividends payable - 2011 Long-Term Incentive Plan ("LTIP")	—		637
	Capital lease payable	16		17
	Total accounts payable and accrued liabilities	$	9,653	$	11,688

Asset_Retirement_Obligations_T

Asset Retirement Obligations (Tables)	3 Months Ended
	Mar. 31, 2015
Asset Retirement Obligation Disclosure [Abstract]
Changes in Asset Retirement Obligation Liabilities	The components of the changes in the asset retirement obligation liabilities were:
		Short-Term			Long-Term			Total
		Portion			Portion
		(Dollars in thousands)
	Balance at January 1, 2015	$	342		$	6,805		$	7,147
	Accretion	31			134			165
	Additions	—			16			16
	Reclassifications	45			(45		)	—
	Amounts paid	(42		)	—			(42		)
	Balance at March 31, 2015	$	376		$	6,910		$	7,286

Other_LongTerm_Liabilities_Tab

Other Long-Term Liabilities (Tables)	3 Months Ended
	Mar. 31, 2015
Other Liabilities Disclosure [Abstract]
Summary of Other Long-Term Liabilities	Other long-term liabilities consisted of the following:
		31-Mar-15		31-Dec-14
		(Dollars in thousands)
	Asset retirement obligations	$	6,910	$	6,805
	Dividends payable — 2015 LTIP	32		—
	Escheat liability	145		220
	Capital lease payable	3		6
	Lease incentive	587		426
	Deferred rent	387		404
	Royalty payable	270		270
	Total other long-term liabilities	$	8,334	$	8,131

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Changes in Stockholders' Equity	Changes in Stockholders’ Equity. Changes in stockholders’ equity for the three months ended March 31, 2015 consisted of:
		(Dollars in thousands)
	Balance at January 1, 2015	$	279,059
	Net income for the three months ended March 31, 2015	3,917
	Cash dividends declared	(2,749		)
	Amortization of stock based compensation	443
	Stock repurchase - 2011 LTIP	(3,825		)
	Stock repurchase - other	(466		)
	Other	(127		)
	Balance at March 31, 2015	$	276,252
Activities Under Equity Plan	The following table summarizes the activities under the 2012 Equity Incentive Award Plan (the "2012 Equity Plan") from inception through March 31, 2015:
		Activity
	Total equity securities available at May 16, 2012	2,194,986
	Add: 2011 LTIP RSUs forfeited by eligible employees	209,382
	Add: Restricted shares of common stock ("restricted stock") forfeited by non-executive member of the Board of Directors	3,189
	Less: 2011 LTIP RSUs awarded to eligible employees	(557,484	)
	Less: Common stock awarded to eligible employees	(5,820	)
	Less: Restricted stock awarded to non-executive members of the Board of Directors	(60,290	)
	Less: Short-Term Incentive Plan (“STIP”) common stock awarded to an eligible employee	(41,702	)
	Less: 2015 LTIP RSUs awarded to eligible employees	(254,777	)
	Total equity securities available at March 31, 2015	1,487,484
Summary of Outstanding RSUs under 2011 LTIP	The following table details activities with respect to RSUs issued and outstanding under the 2015 LTIP for the three months ended March 31, 2015:
			Shares			Weighted-				Total Unrecognized Compensation Cost (net of estimated forfeitures)			Weighted-Average
						Average Grant				(In thousands)			Period Over Which
						Date Fair Value							Cost is  Expected to
													be Recognized
													(In months)
	Non-vested RSUs at January 1, 2015		—			$	—
	Granted		254,777			17.36
	Vested		—			—
	Forfeited		—			—
	Non-vested RSUs at March 31, 2015		254,777			$	17.36			$	4,073		33
Schedule of Stock Based Compensation Expense for Awards Under Equity Plans	The following table reflects the stock based compensation expense for the awards under the 2015 LTIP and predecessor 2011 LTIP:
			For the Three Months Ended March 31,
	Equity Awards		2015				2014
			(Dollars in thousands)
	2011 LTIP		$	—			$	1,014
	2015 LTIP		350				—
	Board of Directors Compensation		93				72
	Total stock based compensation		$	443			$	1,086
Cash Dividends Declared	Cash dividends on RSUs and restricted stock have been accrued and are paid when the applicable vesting conditions are met. Accrued cash dividends on forfeited restricted stock and RSUs are also forfeited.
	Declaration Date		Record Date		Payment Date		Per Share Amount				Total  Payment(1)
											(Dollars in thousands)
	March 4		March 18		March 30		$	0.125			$	2,715
			Total				$	0.125			$	2,715
	(1)	The total payment reflects the cash dividends paid in relation to common stock and vested restricted stock.
Class of Treasury Stock	The following table presents information with respect to purchases made by the Company during the three months ended March 31, 2015:
	Period	Total Number of Shares Purchased		Average Price Paid Per Share			Total Number of Shares Purchased as Part of the Publicly Announced Plans or Programs		Approximate Dollar Value of Shares That May Yet Be Purchased Under the Publicly Announced Plans or Programs
									(Dollars in thousands)
	Beginning Balance								$	15,000
	January 1 through January 31, 2015	16,031		$	16.92		16,031		14,729
	February 1 through February 28, 2015	1,234		16.98			1,234		14,708
	March 1 through March 31, 2015	230,532		17.34			10,202		14,536
	Total	247,797		$	17.31		27,467
Basic and Diluted Net Income Per Common Shares	The components of basic and diluted net income per common share were as follows for the periods stated:
			For the Three Months Ended March 31,
			2015				2014
			(Dollars in thousands, except share and per share amounts)
	Net income		$	3,917			$	4,890
	Weighted average shares of common stock outstanding		21,898,792				21,638,198
	Dilutive effect of restricted stock and RSUs		154,223				399,598
	Weighted average shares of common stock and common stock equivalents		22,053,015				22,037,796
	Net income per common share
	Basic		$	0.18			$	0.23
	Diluted		$	0.18			$	0.22

Stock_Based_Compensation_Table

Stock Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Based Compensation Expense	The following table reflects the statements of income line items for stock based compensation expense for the periods stated:
		For the Three Months Ended March 31,
	Operating Expense Category	2015		2014
		(Dollars in thousands)
	Cost of revenue	$	34	$	81
	Service, rental and maintenance	29		39
	Selling and marketing	51		131
	General and administrative	329		835
	Total stock based compensation	$	443	$	1,086

Prepaid_Expenses_and_Other_Pre

Prepaid Expenses and Other - Prepaid Expenses and Other (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other receivables	$2,000	$751,000
Tax receivables	104,000	155,000
Deposits	641,000	420,000
Prepaid insurance	285,000	517,000
Prepaid rent	119,000	234,000
Prepaid repairs and maintenance	842,000	917,000
Prepaid taxes	503,000	279,000
Prepaid commissions	2,557,000	2,935,000
Prepaid expenses	802,000	1,042,000
Total prepaid expenses and other	5,855,000	7,250,000
Increase (decrease) in deposits	200,000
Increase (decrease) in other receivables	-800,000
Increase (decrease) in prepaid insurance	-200,000
Increase (decrease) in prepaid rent	-100,000
Increase (decrease) in prepaid repairs and maintenance	($100,000)

Inventory_Additional_Informati

Inventory - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Inventory	$3,222,000	$2,673,000
Increase in inventories	$500,000

Depreciation_Amortization_and_2

Depreciation, Amortization and Accretion - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Depreciation, Amortization And Accretion [Abstract]
Depreciation, amortization and accretion expense	$3,747	$4,029

Depreciation_Amortization_and_3

Depreciation, Amortization and Accretion - Summary of Depreciation, Amortization and Accretion (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Depreciation, Amortization And Accretion [Abstract]
Depreciation	$2,207	$2,626
Amortization	1,375	1,216
Accretion	165	187
Total depreciation, amortization and accretion	$3,747	$4,029

Goodwill_and_Amortizable_Intan2

Goodwill and Amortizable Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Goodwill	133,031	$133,031
Amortizable intangible assets, Gross Carrying Amount	41,579
Amortizable intangible assets, Accumulated Amortization	23,256
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, Useful Life	2 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, Useful Life	10 years

Goodwill_and_Amortizable_Intan3

Goodwill and Amortizable Intangible Assets - Net Consolidated Balance of Amortizable Intangible Assets (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amount	$41,579
Amortizable intangible assets, Accumulated Amortization	-23,256
Total amortizable intangible assets	18,323	19,698
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, Useful Life	10 years
Amortizable intangible assets, Gross Carrying Amount	25,002
Amortizable intangible assets, Accumulated Amortization	-10,209
Total amortizable intangible assets	14,793
Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amount	8,453
Amortizable intangible assets, Accumulated Amortization	-8,082
Total amortizable intangible assets	371
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, Useful Life	5 years
Amortizable intangible assets, Gross Carrying Amount	2,370
Amortizable intangible assets, Accumulated Amortization	-2,270
Total amortizable intangible assets	100
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, Useful Life	3 years
Amortizable intangible assets, Gross Carrying Amount	5,754
Amortizable intangible assets, Accumulated Amortization	-2,695
Total amortizable intangible assets	$3,059
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, Useful Life	2 years
Minimum [Member] | Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, Useful Life	2 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, Useful Life	10 years
Maximum [Member] | Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, Useful Life	4 years

Goodwill_and_Amortizable_Intan4

Goodwill and Amortizable Intangible Assets - Estimated Amortization of Intangible Assets (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]
For the remaining nine months ending December 31, 2015	$3,360
2016	4,160
2017	2,886
2018	2,500
2019	2,500
Thereafter	2,917
Total amortizable intangible assets	$18,323	$19,698

Other_Assets_Schedule_of_Other

Other Assets - Schedule of Other Assets (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deposits	$936	$189
Prepaid royalty	242	242
Other assets	440	431
Total other assets	$1,618	$862

Accounts_Payable_and_Accrued_L2

Accounts Payable and Accrued Liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Payables and Accruals [Abstract]
Accounts payable	$1,215	$2,784
Accrued network costs	1,059	1,072
Accrued taxes	4,533	4,195
Asset retirement obligations	376	342
Accrued outside services	1,016	1,101
Accrued accounting and legal	253	275
Accrued recognition awards	321	345
Accrued other	709	696
Deferred rent	77	77
Escheat liability	38	0
Lease incentive	40	147
Dividends payable - 2011 Long-Term Incentive Plan (LTIP)	0	637
Capital lease payable	16	17
Total accounts payable and accrued liabilities	$9,653	$11,688

Asset_Retirement_Obligations_A

Asset Retirement Obligations - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Asset Retirement Obligation Liabilities [Line Items]
Cumulative asset retirement costs	2.8	$2.80
Minimum [Member]
Asset Retirement Obligation Liabilities [Line Items]
Estimated lives for depreciation of asset retirement cost additions	51 months
Maximum [Member]
Asset Retirement Obligation Liabilities [Line Items]
Estimated lives for depreciation of asset retirement cost additions	57 months

Asset_Retirement_Obligations_C

Asset Retirement Obligations - Changes in Asset Retirement Obligation Liabilities (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Asset Retirement Obligation Liabilities [Line Items]
Beginning balance	$7,147
Accretion	165
Additions	16
Reclassifications	0
Amounts paid	-42
Ending balance	7,286
Short-Term Portion [Member]
Asset Retirement Obligation Liabilities [Line Items]
Beginning balance	342
Accretion	31
Additions	0
Reclassifications	45
Amounts paid	-42
Ending balance	376
Long-Term Portion [Member]
Asset Retirement Obligation Liabilities [Line Items]
Beginning balance	6,805
Accretion	134
Additions	16
Reclassifications	-45
Amounts paid	0
Ending balance	$6,910

Deferred_Revenue_Additional_In

Deferred Revenue - Additional Information (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Revenue Recognition [Abstract]
Deferred revenue, current	$24,612	$24,034
Deferred revenue, non-current	$888	$937

LongTerm_Debt_Additional_Infor

Long-Term Debt - Additional Information (Detail) (USD $)	Mar. 31, 2015
Debt Disclosure [Abstract]
Long-term Debt	$0

Other_LongTerm_Liabilities_Sum

Other Long-Term Liabilities - Summary of Other Long-Term Liabilities (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
	lease
Other Liabilities Disclosure [Abstract]
Asset retirement obligations	$6,910,000	$6,805,000
Dividends payable - 2015 LTIP	32,000	0
Escheat liability	145,000	220,000
Capital lease payable	3,000	6,000
Lease incentive	587,000	426,000
Deferred rent	387,000	404,000
Royalty payable	270,000	270,000
Total other long-term liabilities	8,334,000	8,131,000
Increase in lease incentives	$200,000
Number of corporate leases	2

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)	1 Months Ended			3 Months Ended		34 Months Ended	0 Months Ended
	Mar. 31, 2015	Feb. 28, 2015	Jan. 31, 2015	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Jan. 01, 2015	Dec. 09, 2014	Dec. 31, 2014	Apr. 29, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized	75,000,000			75,000,000		75,000,000
Common stock par value	$0.00			$0.00		0.0001
Preferred stock authorized	25,000,000			25,000,000		25,000,000
Preferred stock par value	$0.00			$0.00		0.0001
Common stock outstanding	21,739,412			21,739,412		21,739,412			21,978,762
Preferred stock outstanding	0			0		0			0
Total stock based compensation				$443,000	$1,086,000
Declaration date				29-Apr-15
Record Date				22-May-15
Payment Date				25-Jun-15
Total number of shares purchased	230,532	1,234	16,031	247,797
Expected amount for dividends and/or common stock repurchases	26,000,000			26,000,000		26,000,000
Increase (decrease) in additional paid-in capital				-4,000,000
Additional paid-in capital	122,704,000			122,704,000		122,704,000			126,678,000
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend rate										$0.13
Dividends declared										2,700,000
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Shares						5,820
Non-executive directors [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Shares						60,290
2015 LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation				350,000	0
2015 LTIP [Member] | Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period								36 months
Granted, Shares				254,777		254,777	254,777
Granted, Value							4,400,000
Shares outstanding	254,777			254,777		254,777			0
2015 LTIP [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Shares							254,777
Common Stock Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase authority							15,000,000
Total number of shares purchased	10,202	1,234	16,031	27,467
Treasury stock acquired, value				$500,000

Stockholders_Equity_Changes_in

Stockholders' Equity - Changes in Stockholders' Equity (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$279,059
Net income for the three months ended March 31, 2015	3,917	4,890
Cash dividends declared	-2,749
Amortization of stock based compensation	443
Issued, purchased, retired common stock, and other	-127
Ending Balance	276,252
2011 LTIP [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock repurchase	-3,825
Other Repurchase Plan [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock repurchase	($466)

Stockholders_Equity_Activities

Stockholders' Equity - Activities Under Equity Plan (Detail)	34 Months Ended	0 Months Ended	3 Months Ended
	Mar. 31, 2015	Jan. 01, 2015	Mar. 31, 2015	16-May-12
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total equity securities available at May 16, 2012				2,194,986
Total equity securities available at March 31, 2015	1,487,484		1,487,484
Short-Term Incentive Plan ("STIP") [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Less: Equity Plan shares awarded	-41,702
Restricted Stock Units [Member] | 2011 LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Add: 2011 LTIP RSUs forfeited by eligible employees	209,382
Less: Equity Plan shares awarded	-557,484
Restricted Stock Units [Member] | 2015 LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Add: 2011 LTIP RSUs forfeited by eligible employees			0
Less: Equity Plan shares awarded	-254,777	-254,777	-254,777
Restricted Stock [Member] | Non-executive directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Add: 2011 LTIP RSUs forfeited by eligible employees	3,189
Less: Equity Plan shares awarded	-60,290
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Less: Equity Plan shares awarded	-5,820
Common Stock [Member] | 2015 LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Less: Equity Plan shares awarded		-254,777

Stockholders_Equity_Summary_of

Stockholders' Equity - Summary of outstanding RSUs under the 2015 LTIP (Detail) (Restricted Stock Units [Member], 2015 LTIP [Member], USD $)	0 Months Ended	3 Months Ended	34 Months Ended
In Thousands, except Share data, unless otherwise specified	Jan. 01, 2015	Mar. 31, 2015	Mar. 31, 2015
Restricted Stock Units [Member] | 2015 LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning Balance, Shares	0	0
Granted, Shares	254,777	254,777	254,777
Vested, Shares		0
Forfeited, Shares		0
Ending Balance, Shares		254,777	254,777
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning Balance, Weighted Average Grant Date Fair Value	$0	$0
Granted, Weighted Average Grant Date Fair Value		$17.36
Vested, Weighted Average Grant Date Fair Value		$0
Forfeited, Weighted Average Grant Date Fair Value		$0
Ending Balance, Weighted Average Grant Date Fair Value		$17.36	$17.36
Total Unrecognized Compensation Cost (net of estimated forfeitures)		$4,073	$4,073
Weighted-Average Period Over Which Cost is Expected to be Recognized		33 months

Stockholders_Equity_Schedule_o

Stockholders' Equity - Schedule of Stock Based Compensation Expense for Awards Under Equity Plans (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	$443	$1,086
2011 LTIP [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	0	1,014
2015 LTIP [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	350	0
Board of Directors Compensation [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	$93	$72

Stockholders_Equity_Cash_Divid

Stockholders' Equity - Cash Dividends Declared to Stockholders (Detail) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Declaration date	29-Apr-15
Record Date	22-May-15
Payment Date	25-Jun-15
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Per Share Amount	0.125
Total Payment	2,715
Common Stock [Member] | Installment One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Declaration date	4-Mar-15
Record Date	18-Mar-15
Payment Date	30-Mar-15
Per Share Amount	0.125
Total Payment	2,715

Stockholders_Equity_Treasury_S

Stockholders' Equity - Treasury Stock (Details) (USD $)	1 Months Ended			3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Feb. 28, 2015	Jan. 31, 2015	Mar. 31, 2015	Jan. 01, 2015
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased	230,532	1,234	16,031	247,797
Average Price Paid Per Share	$17.34	$16.98	$16.92	$17.31
Approximate Dollar Value of Shares That May Yet Be Purchased Under the Publicly Announced Plans or Programs	$14,536	$14,708	$14,729	$14,536	$15,000
Common Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Total Number of Shares Purchased	10,202	1,234	16,031	27,467

Stockholders_Equity_Basic_and_

Stockholders' Equity - Basic and Diluted Net Income Per Common Shares (Detail) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Equity [Abstract]
Net income	$3,917	$4,890
Weighted average shares of common stock outstanding	21,898,792	21,638,198
Dilutive effect of restricted stock and RSUs	154,223	399,598
Weighted average shares of common stock and common stock equivalents	22,053,015	22,037,796
Basic (usd per share)	$0.18	$0.23
Diluted (usd per share)	$0.18	$0.22

Stock_Based_Compensation_Stock

Stock Based Compensation - Stock Based Compensation Expense (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	$443	$1,086
Cost of Revenue [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	34	81
Service, Rental and Maintenance [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	29	39
Selling and Marketing [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	51	131
General and Administrative [Member]
Share based Compensation Allocation of Recognized Period Cost [Line Items]
Total stock based compensation	$329	$835

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Jan. 02, 2014
Income Tax Disclosure [Abstract]
Deferred tax assets, gross	$136.40	$138.30
Valuation allowance	114.1	114.2
Estimated recoverable deferred income tax assets	22.2	24.1
Percentage of probability of deferred income tax realized in future	50.00%
Valuation allowance, methodologies and assumptions	"more likely than not" (greater than a 50% probability)
Federal income tax at statutory rate	35.00%
Approximate Federal net operating losses ("NOLs") available to offset future taxable income	308.6
Limited net operating losses rate under "IRC Section 382"			44.3
Allowable net operating losses utilize per year under "IRC Section 382"			$6.10

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Related Party Transactions [Abstract]
Site rent expense	$1	$1