Equity-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Granted	0	0	0
Unearned compensation costs related to awards granted	$ 17,646,000
Unearned compensation cost, expected to be recognized over period (years)	2 years 3 months 18 days
Expected weighted-average life	5 years 5 months 1 day	5 years 5 months 23 days	5 years 5 months 1 day
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected weighted-average life	3 months
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected weighted-average life	1 year
Stock Option and Stock Appreciation Rights (SARs) [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Stock Option and Stock Appreciation Rights (SARs) [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
2011 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance of awards	5,500,000
Shares available for grant	4,212,339
Options outstanding	691,874
Expiration period (in years)	10 years
Expiration period, if employee is terminated involuntarily other than for cause (days)	90 days
Expiration period, if employee voluntarily terminates his or her employment (days)	30 days
Expiration period, if employee's employment terminates due to death, disability, or retirement (Years)	1 year
RSA [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
RSA [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
2006 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (in years)	10 years
Expiration period, if employee is terminated involuntarily other than for cause (days)	90 days
Expiration period, if employee voluntarily terminates his or her employment (days)	30 days
Expiration period, if employee's employment terminates due to death, disability, or retirement (Years)	1 year
Shares outstanding and exercisable	1,111,435
1997 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding and exercisable	471,990
2002 Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding and exercisable	80,000
Expiration period (in years)	10 years
WhereNet Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding and exercisable	3,262
2011 Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum working hours per week			20
Maximum percentage of compensation deductions			10.00%
Stock purchase plan expense	$ 224,000	$ 242,000	$ 321,000
2011 Stock Purchase Plan [Member] | Date Of The Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of purchase price on fair market value			95.00%
2011 Stock Purchase Plan [Member] | Date Of Purchase [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of purchase price on fair market value			95.00%
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	1,402,784	1,535,804	1,287,724	1,234,787
Expiration period (in years)	10 years
Shares outstanding and exercisable	520,426	514,787	305,228
Shares, Granted	326,811	431,040	387,847
Shares expected to vest		20,155
Stock Appreciation Rights (SARs) [Member] | Vest Annually In Each Of First Four Anniversaries [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares expected to vest	326,811	410,885