Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Deferred rent	$ 409	$ 508
Accrued vacation	2,153	2,480
Accrued bonus	2,916	2,747
Deferred compensation	1,816	1,497
Inventory items	6,061	6,967
Allowance for doubtful accounts and other receivables	118	211
Other accruals	11,149	6,531
Equity based compensation expense	12,337	16,620
Unrealized gain on securities	558	438
Unrealized loss on other investments	410	419
Net operating loss carry-forwards	597	2,462
Valuation allowance	(267)	(267)	(267)	(267)
Total deferred tax assets	38,257	40,613
Unrealized loss on other investments	(1,450)	0
Depreciation and amortization	(42,489)	(24,527)
Total deferred tax liabilities	(43,939)	(24,527)
Net deferred tax assets (liabilities)	$ (5,682)	$ 16,086