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Fair Value Measurement (Detail) - (Table) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value [Member]
Assets:
Cash Equivalents	$ 4,389	$ 5,707
Current marketable securities – available for sale	21,731	16,285
Long-term marketable securities – available for sale	101,478	81,202
Total assets	135,953	110,021
Liabilities:
Contingent consideration	46,810	41,960
Total liabilities	46,810	41,960
Fair Value [Member] | Note receivable – related party [Member]
Assets:
Notes Receivable, Fair Value Disclosure	3,600	3,581
Fair Value [Member] | Forward contracts [Member]
Assets:
Notes Receivable, Fair Value Disclosure	1,670	161
Fair Value [Member] | Note receivable – Seller of SM Canada [Member]
Assets:
Notes Receivable, Fair Value Disclosure	3,085	3,085
Fair Value, Inputs, Level 1 [Member]
Assets:
Cash Equivalents	4,389	5,707
Current marketable securities – available for sale	21,731	16,285
Long-term marketable securities – available for sale	101,478	81,202
Total assets	127,598	103,194
Liabilities:
Contingent consideration	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 1 [Member] | Note receivable – related party [Member]
Assets:
Notes Receivable, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Forward contracts [Member]
Assets:
Notes Receivable, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Note receivable – Seller of SM Canada [Member]
Assets:
Notes Receivable, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member]
Assets:
Cash Equivalents	0	0
Current marketable securities – available for sale	0	0
Long-term marketable securities – available for sale	0	0
Total assets	1,670	161
Liabilities:
Contingent consideration	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 2 [Member] | Note receivable – related party [Member]
Assets:
Notes Receivable, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member] | Forward contracts [Member]
Assets:
Notes Receivable, Fair Value Disclosure	1,670	161
Fair Value, Inputs, Level 2 [Member] | Note receivable – Seller of SM Canada [Member]
Assets:
Notes Receivable, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member]
Assets:
Cash Equivalents	0	0
Current marketable securities – available for sale	0	0
Long-term marketable securities – available for sale	0	0
Total assets	6,685	6,666
Liabilities:
Contingent consideration	46,810	41,960
Total liabilities	46,810	41,960
Fair Value, Inputs, Level 3 [Member] | Note receivable – related party [Member]
Assets:
Notes Receivable, Fair Value Disclosure	3,600	3,581
Fair Value, Inputs, Level 3 [Member] | Forward contracts [Member]
Assets:
Notes Receivable, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Note receivable – Seller of SM Canada [Member]
Assets:
Notes Receivable, Fair Value Disclosure	$ 3,085	$ 3,085

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