Activity in Allowance Accounts Related to Accounts Receivable and Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Accounts Receivable Allowances
Balance at Beginning of Year	$ 887		$ 1,237		$ 856
Charged to Operations	1,601	[1]	1,509	[1]	990	[1]
Deductions	(1,093)	[2]	(1,859)	[2]	(609)	[2]
Balance at End of Year	1,395		887		1,237
Deferred Tax Asset Valuation Allowance
Balance at Beginning of Year	2,581		975		607
Charged to Operations	442		1,606		368
Balance at End of Year	$ 3,023		$ 2,581		$ 975

[1] Amounts represent charges to general and administrative expense for increases to the allowance for doubtful accounts.

[2] Amounts represent cash collections from customers for accounts previously reserved and write-offs of accounts receivable recorded against the allowance for doubtful accounts.