Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 566	$ 488	$ 415
Additions Charged to Costs and Expenses	430	115	126
Additions Charged to Other Accounts			76	[1]
Deductions	507	37	129
Balance at End of Period	489	566	488
Valuation Allowance of Deferred Tax Assets
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	4,120	2,008	1,323
Additions Charged to Costs and Expenses	999	2,182	685
Deductions	102	70
Balance at End of Period	$ 5,017	$ 4,120	$ 2,008

[1] The approximately $0.1 million charged to other accounts was related to acquisitions.