Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Income Tax [Line Items]
Federal statutory income tax rate		35.00%
Increase in tax benefit due to discrete items		$ 12,707	$ 12,400
Increase in tax benefit due to reversal of uncertain tax positions and accrued interest		12,869
Unrecognized tax benefits due to settlement of tax examination	1,015
Impact on effective tax rate	660		660
Reversal of accrued interest related to unrecognized tax benefits	966
Reversal of accrued interest, impact on effective tax rate	584
Included tax benefits discontinued operation tax provision		4,582	2,588
Increase in tax benefit due to company's restructuring			15,000
Total benefit reflected in income tax provision due to reversals of tax and interest	1,244
Long-term income taxes payable		52,590		63,465
Maximum unrecorded tax benefit		15,000
United States
Income Tax [Line Items]
Unrecognized tax benefits due to settlement of tax examination		11,846
Impact on effective tax rate		11,655
Reversal of accrued interest related to unrecognized tax benefits		2,006
Reversal of accrued interest, impact on effective tax rate		$ 1,214