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Accounts Receivable, Net of Reserve for Doubtful Receivables - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	$ 491,579	$ 461,062
Reserve for doubtful receivables	14,519	9,073
Net accounts receivable	477,060	451,989
Accounts receivable due after one year	17,006	19,140
Accounts receivable from related parties	63	64
Reserve for doubtful receivables from related parties	0	35
Net accounts receivable from related parties	$ 63	$ 29

X

- Definition

Amount due from related parties, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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A valuation allowance for trade and other receivables due from related party within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

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Amounts due from customers or clients, more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business.

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