Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Consolidated net income	$ 31,988	$ 989	$ 172,130	$ 17,079
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	1,569	635	(1,554)	(1,275)
Unrealized gain on securities available-for-sale	60		60
Total other comprehensive income (loss), net of tax	1,629	635	(1,494)	(1,275)
Comprehensive income	33,617	1,624	170,636	15,804
Less: Comprehensive income attributable to noncontrolling interest in subsidiaries, net of tax	6,908	1,551	105,126	7,165
Comprehensive income attributable to common stockholders	$ 26,709	$ 73	$ 65,510	$ 8,639