Fair Value Measurements - Changes in Level 3 Financial Assets and Liabilities Measured on Recurring Basis (Detail) - Accounts Payable and Accrued Expenses and Other Liabilities [Member] - Contingent Consideration [Member] - USD ($) $ in Thousands |
6 Months Ended | |
---|---|---|
Jun. 30, 2015 |
Jun. 30, 2014 |
|
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] | ||
Beginning Balance, Contingent Consideration | $ 1,452 | $ 13,014 |
Revaluations included in earnings | 5,886 | 186 |
Ending Balance, Contingent Consideration | $ 7,338 | $ 13,200 |