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Leases - Additional Information (Detail) (USD $)	12 Months Ended
Leases - Additional Information (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating and Capital Leases [Line Items]
Operating Leases, Rent Expense, Net, Total	$ 6,663,000	$ 5,371,000	$ 3,753,000
Equipment Expense	1,524,000	1,926,000	1,929,000
Accrued Rent, Current	1,131,000
Minimum [Member]
Operating and Capital Leases [Line Items]
Control Centers leases term	5 years
Control Centers leases range price	1,500
Maximum [Member]
Operating and Capital Leases [Line Items]
Control Centers leases term	10 years
Control Centers leases range price	$ 5,000

Carrying value as of the balance sheet date of obligations incurred through that date and payable for contractual rent under lease arrangements. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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