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Fair Value of Financial Assets and Liabilities - Changes in Level 3 Rate Lock Commitments, Forwards and Contingent Consideration Measured at Fair Value on Recurring Basis (Detail) - Level 3 [Member] - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accounts Payable Accrued and Other Liabilities [Member] | Contingent Consideration [Member]    
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Opening Balance, Liabilities $ 67,172 $ 65,838
Total realized and unrealized gains (losses) included in Net income (loss), Liabilities [1] (707) (1,111)
Unrealized gains (losses) included in Other comprehensive income (loss), Liabilities (863) (211)
Purchases/ Issuances, Liabilities 22 6,190
Sales/ Settlements, Liabilities (9,522) (10,153)
Closing Balance, Liabilities 59,242 63,197
Unrealized gains (losses) for Level 3 Liabilities Outstanding (1,570) (1,322)
Rate Lock Commitments And Forwards, Net [Member]    
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Opening Balance, Assets 3,629 10,254
Total realized and unrealized gains (losses) included in Net income (loss), Assets [1] 7,036 2,462
Sales/ Settlements, Assets (3,629) (10,254)
Closing Balance, Assets 7,036 2,462
Unrealized gains (losses) for Level 3 Assets Outstanding $ 7,036 $ 2,462
[1] Realized and unrealized gains (losses) are reported in “Other expenses” and “Other income (loss),” as applicable, in the Company’s unaudited condensed consolidated statements of operations.