Supplemental Cash Flow Disclosures - Schedule of Non-cash Investing and Financing Activities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Cash Flow Elements [Abstract]
Business acquisitions, including contingent consideration earned	$ 2,417	$ 11,849	$ 19,601
Estimated contingent purchase price payable	$ 5,288	$ 15,659	$ 9,735

- Definition

The net book value of a nonmonetary asset transferred or exchanged in connection with the acquisition of a business or asset in a noncash transaction. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Nonmonetary assets and liabilities are assets and liabilities that will not result in cash receipts or cash payments in the future.

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