Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012 Employee Y M	Jan. 23, 2012 sqft
Commitments and Contingencies Disclosure [Line Items]
Number of senior officers with employment agreements		8
Annual employee benefits compensation committed		$ 3.1
Number of years employment agreement renewed, period		One
Severance agreements, installment payment period		2 months
Term of employment agreement, in years		3
Retention awards vesting percentage of award on specific dates		50.00%
Award vesting period, years		2 years
Severance expense	1.1	1.7
Rentable square feet of office facilities			48,000
New lease term, months		123
Number of lease renewal options		2
Number of years lease agreement, renewal option		5
Aggregate minimum lease commitment	15.2	15.2
Letter of credit to secure obligations under lease		1.6
Tenant improvement allowance		2.0
During 2012
Commitments and Contingencies Disclosure [Line Items]
Potential commitment of retention awards		1.1
During 2013
Commitments and Contingencies Disclosure [Line Items]
Potential commitment of retention awards		1.1
Workforce Reduction
Commitments and Contingencies Disclosure [Line Items]
Severance expense	1.0	1.0
Retention Agreement | During 2013
Commitments and Contingencies Disclosure [Line Items]
Potential commitment of retention awards		0.8
Retention Agreement | During 2014
Commitments and Contingencies Disclosure [Line Items]
Potential commitment of retention awards		0.8
Minimum
Commitments and Contingencies Disclosure [Line Items]
Plan of reorganization, annual operating expenses to be reduce by 2013		45
Maximum
Commitments and Contingencies Disclosure [Line Items]
Plan of reorganization, annual operating expenses to be reduce by 2013		$ 50