Income Taxes - Schedule of Net Operating Loss Carryforwards (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	612,387
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	291,366
States [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	171,086
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	149,935
2013 to 2015 [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	68
2013 to 2015 [Member] | Foreign [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	68
2016 to 2018 Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	177,511
2016 to 2018 Member] | States [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	134,846
2016 to 2018 Member] | Foreign [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	42,665
2019 to 2021 [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	238,449
2019 to 2021 [Member] | Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	208,826
2019 to 2021 [Member] | States [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	10,126
2019 to 2021 [Member] | Foreign [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	19,497
2022 to 2024 [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	82,866
2022 to 2024 [Member] | Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	67,966
2022 to 2024 [Member] | States [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	14,900
2025 to 2027 [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	20,163
2025 to 2027 [Member] | Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	13,306
2025 to 2027 [Member] | States [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	6,857
2028 to 2030 [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	5,235
2028 to 2030 [Member] | Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	1,268
2028 to 2030 [Member] | States [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	3,967
Thereafter [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	88,095
Thereafter [Member] | States [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	390
Thereafter [Member] | Foreign [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	87,705
Minimum [Member] | 2013 to 2015 [Member]
Operating Loss Carryforwards [Line Items]
Expiration dates	2013
Minimum [Member] | 2016 to 2018 Member]
Operating Loss Carryforwards [Line Items]
Expiration dates	2016
Minimum [Member] | 2019 to 2021 [Member]
Operating Loss Carryforwards [Line Items]
Expiration dates	2019
Minimum [Member] | 2022 to 2024 [Member]
Operating Loss Carryforwards [Line Items]
Expiration dates	2022
Minimum [Member] | 2025 to 2027 [Member]
Operating Loss Carryforwards [Line Items]
Expiration dates	2025
Minimum [Member] | 2028 to 2030 [Member]
Operating Loss Carryforwards [Line Items]
Expiration dates	2028
Minimum [Member] | Thereafter [Member]
Operating Loss Carryforwards [Line Items]
Expiration dates	Thereafter
Maximum [Member] | 2013 to 2015 [Member]
Operating Loss Carryforwards [Line Items]
Expiration dates	2015
Maximum [Member] | 2016 to 2018 Member]
Operating Loss Carryforwards [Line Items]
Expiration dates	2018
Maximum [Member] | 2019 to 2021 [Member]
Operating Loss Carryforwards [Line Items]
Expiration dates	2021
Maximum [Member] | 2022 to 2024 [Member]
Operating Loss Carryforwards [Line Items]
Expiration dates	2024
Maximum [Member] | 2025 to 2027 [Member]
Operating Loss Carryforwards [Line Items]
Expiration dates	2027
Maximum [Member] | 2028 to 2030 [Member]
Operating Loss Carryforwards [Line Items]
Expiration dates	2030