Income Taxes - Summary of Deferred Tax Asset and Liability (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax asset
Fixed assets	$ 7,236	$ 6,133
Basis difference of investments	12,266	8,772
Deferred compensation	53,987	13,380
Other deferred and accrued expenses	21,393	2,884
Net operating loss and credit carry-forwards	47,210	29,058
Total deferred tax asset (1)	142,092	60,227
Valuation allowance	(20,403)	(24,288)
Deferred tax asset, net of valuation allowance	121,689	35,939
Deferred tax liability
Software capitalization	8,374	4,435
Depreciation of fixed assets / Gain on replacements of assets	732	572
Other	394	731
Total deferred tax liability (1)	9,500	5,738
Net deferred tax asset	$ 112,189	$ 30,201