Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan investments	$ 19,156	$ 18,883
Total assets measured at fair value	19,156	18,883
Warrant liability	55,989
Total liabilities measured at fair value	55,989
Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan investments	19,156	18,883
Total assets measured at fair value	19,156	18,883
Warrant liability	0
Total liabilities measured at fair value	0
Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan investments	0	0
Total assets measured at fair value	0	0
Warrant liability	55,989
Total liabilities measured at fair value	55,989
Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan investments	0	0
Total assets measured at fair value	0	0
Warrant liability	0
Total liabilities measured at fair value	$ 0