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Significant Accounting Policies - Reconciliation of Allowance for Doubtful Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]
Beginning balance	$ 6,544	$ 7,263	$ 9,411
Provision	6,798	2,830	2,028
Write-off of uncollectible amounts, net of recoveries	(1,687)	(3,549)	(4,176)
Ending balance	$ 11,655	$ 6,544	$ 7,263

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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