Fair Value Disclosures - Carrying Value and Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for sale, carrying value	$ 118,997	$ 201,733
Mortgage warehouse borrowings	91,166	183,444
Loans payable and other borrowings	142,786	134,824
Carrying Value	1,681,944	1,663,372
Significant Other Observable Inputs (Level 3) [Member] | Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability	16,882	20,082
Significant Other Observable Inputs (Level 3) [Member] | Estimated Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liability	16,882	20,082
Revolving Credit Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	211,084	109,947
Revolving Credit Facility [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	211,084	109,947
Estimated Fair Value	215,000	115,000
Loans Payable and Other Borrowings [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans payable and other borrowings	142,786	134,824
Estimated Fair Value	142,786	134,824
Mortgage Warehouse Borrowings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	91,166	183,444
Mortgage Warehouse Borrowings [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage warehouse borrowings	91,166	183,444
Estimated Fair Value	91,166	183,444
5.25% Senior Notes due 2021 [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	544,611	543,713
Estimated Fair Value	567,875	552,750
5.875% Senior Notes due 2023 [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	346,289	345,840
Estimated Fair Value	366,625	346,500
5.625% Senior Notes due 2024 [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	346,008	345,604
Estimated Fair Value	360,500	336,000
Mortgage Loans Held for Sale [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for sale, carrying value	118,997	201,733
Mortgage loans held for sale, estimated fair value	$ 118,997	$ 201,733